diff --git a/solution1.py b/solution1.py
new file mode 100644
index 0000000..462e72a
--- /dev/null
+++ b/solution1.py
@@ -0,0 +1,14 @@
+"""ex.1
+Create two variables a and b, and initially set them each to a different number. 
+Write a program that swaps both values."""
+
+def input_variables(a, b):
+    temporary_c = a                #assign the value of a to the temporary variable c
+    a = b                          #assign the value of b to a, now a has b's value
+    b = temporary_c                #now b has a's original value
+    return (a, b)
+
+x = 7
+y = 8
+result = input_variables(x, y)
+print("The swapped values are", result)
diff --git a/solution10.py b/solution10.py
new file mode 100644
index 0000000..6b7ff6a
--- /dev/null
+++ b/solution10.py
@@ -0,0 +1,25 @@
+"""ex.10
+Create a program that prints the last digit of a given integer
+
+Create a program that:
+1) Reads the integer
+2) Prints the last digit
+Warning! Do not use the programming language MAGIC. After you complete the exercise feel free to do so.
+Warning! Don't try to convert the number into string etc.
+Warning! For this problem it's ok after spending some time to look for the solution."""
+
+
+number = int(input("enter any integer: "))
+
+if number in range(0, 9):
+    print (number)
+elif number > 9:
+    while number >9:
+        number = number - 10
+    print (number)
+else:
+    while number <-10:
+        number = number + 10
+        number *= -1    
+        print (number)
+
diff --git a/solution11.py b/solution11.py
new file mode 100644
index 0000000..02a5f9e
--- /dev/null
+++ b/solution11.py
@@ -0,0 +1,26 @@
+"""
+ex.11
+You have started working and you are wondering how many things you can buy with the money 
+you've earned. A PS4 costs 200$, a Samsung phone 900$, a TV 500$, a game skin 9.99$
+
+Create a program:
+* Notice that you can't but half TV or 1/4 of PS4.
+* Reads how many hours you've worked
+* Reads your hourly income
+* Prints how many items you can buy
+* Output: "I can buy 4 PS4, 1 Samsung, 3 TV, 80 game skin"
+"""
+
+def calculate_income(hours_worked, hourly_pay):
+    money_earned = hours_worked * hourly_pay
+    number_PS4 = money_earned // 200
+    number_phone = money_earned // 900
+    number_TV = money_earned // 500
+    number_gameskin = money_earned // 9.99
+    return number_PS4, number_phone, number_TV, number_gameskin
+
+hours = 40
+pay_per_hour = 100
+ps4, ph, tv, gs = calculate_income(hours, pay_per_hour)
+print(f"I can buy {ps4} PS4, {ph} Samsung phones, {tv}TVs and {gs} game skins")
+
diff --git a/solution12.py b/solution12.py
new file mode 100644
index 0000000..23dbf91
--- /dev/null
+++ b/solution12.py
@@ -0,0 +1,36 @@
+"""# ex.12
+You've consumed X amount of Mbps on Wikipedia and Y amount of Mbps on memes. The cost of visiting Wikipedia is 0,10$ per Mb
+and the cost for watching memes is 0,05$ per Mb. If total consumption  is more than 100$ print "Too much consumption".
+If watching meme consumption is greater than reading wikipedia consumption print "WOW MANY MEMES", "SUCH LOL"(in new line).
+
+Create a program that:
+* Reads X(wikipedia Mb consupmtion) and Y(watching meme Mb consumption)
+* Calculates the total consumption
+* If total consumption greater than 100$ print proper message
+* If watching meme consumption  is greater than reading wikipedia articles print proper messages
+
+Warning! For the greater meme consumption you will use one print statement and the output must be in seperate lines
+"""
+
+def calculate_consumption(X_wikipedia, Y_memes, time_in_sec_wiki, time_in_sec_memes):
+    consumption_wiki = (X_wikipedia/0.10) * time_in_sec_wiki
+    consumption_memes = (Y_memes/0.05) * time_in_sec_memes
+    total_consumption = consumption_wiki + consumption_memes
+    if total_consumption > 100:
+        print("Too much consumption")
+    if consumption_memes > consumption_wiki:
+        print("WOW MANY MEMES\nSUCH LOL")
+    return consumption_wiki, consumption_memes, total_consumption
+
+
+
+
+X = 400
+Y = 300
+time_wiki = 60
+time_memes = 50
+wiki, meme, con = calculate_consumption(X, Y, time_wiki, time_memes)
+print(f"The cost of your wikipedia usage is {wiki} and the cost of your memes usage is {meme} your total consumption is {con}")
+
+
+
diff --git a/solution13.py b/solution13.py
new file mode 100644
index 0000000..971988f
--- /dev/null
+++ b/solution13.py
@@ -0,0 +1,34 @@
+"""# ex.13
+An internet cafe has 2 ways of charging. If the user is a member pays 2$/hour, Else the user pays 5$. Find if someone is a member or not 
+and calculate the price based on how many hours the user spend. If the user is a member the tax is 10% else the tax is 20%.
+
+Create a program that:
+* Reads how many hours the user spend
+* Check if is a member
+* Add the proper tax fee
+* Print the total amount the user has to pay
+* Output: "The user is a member stayed 2 hours for 2$/hour plus the 10% the total amount is 4.4$"
+"""
+
+def calculate_payment (hours_used, membership):
+    if membership == "yes":
+        basic_payment = hours_used * 2      #hours spent * $2 for member
+        total_payment = basic_payment * 1.1 #basic payment + 10% tax for member
+        total_payment = round(total_payment, 2)
+        description = "member"
+        rate = "$2/hour"
+        tax = "10%"
+    else:
+        basic_payment = hours_used * 5      #hours spent * $5 for non-member
+        total_payment = basic_payment * 1.2  #basic payment + 20% tax for non-member
+        total_payment = round(total_payment, 2)
+        description = "non-member"
+        rate = "$5/hour"
+        tax = "20%"
+    return total_payment, description, rate, tax
+
+
+member = "no"
+hours = 10 
+money_owed, desc, hourly_rate, taxes = calculate_payment (hours, member)
+print(f"The user is a {desc} and stayed {hours} hours for {hourly_rate} plus the {taxes} the total amount is {money_owed}")
diff --git a/solution14.py b/solution14.py
new file mode 100644
index 0000000..9d160ff
--- /dev/null
+++ b/solution14.py
@@ -0,0 +1,34 @@
+"""# ex.14
+You want to buy something from Amazon. The seller charges different prices for shipping cost based on location.
+ For US it's 5$, for Europe it's 7$, for Canada it's 3$, for other places it's 9$
+
+Create a program that:
+* Reads the cost of the product
+* Reads your location
+* Print the amount of money you have to pay
+* Ouput: "You have to pay 23$, 20$ for the product and 3$ for shipping cost"
+"""
+
+
+def total_cost(item_cost, location):
+    if location == "US":
+        shipping_fee = "$5"
+        total_due = item_cost + 5
+    elif location == "Europe":
+        shipping_fee = "$7"
+        total_due = item_cost + 7
+    elif location == "Canada":
+        shipping_fee = "$3"
+        total_due = item_cost + 3
+    else:
+        shipping_fee = "$9"
+        total_due = item_cost + 9
+    return total_due, shipping_fee
+
+item_costs = 10
+place = "US"
+pay, shipping = total_cost(item_costs, place)
+print(f"You have to pay ${pay}, {item_costs}$ for the product and {shipping} for shipping cost")
+
+
+    
\ No newline at end of file
diff --git a/solution15.py b/solution15.py
new file mode 100644
index 0000000..4f0c238
--- /dev/null
+++ b/solution15.py
@@ -0,0 +1,42 @@
+"""
+# ex.15
+A cell phone company has the following billing policy
+
+|  | Fixed cost 25$  |
+|---------|--------------|
+| Call duration(in seconds)| Charge($/per second)|
+| 1-500 | 0,01 |
+| 501-800 | 0,008 |
+| 801+ | 0,005 |
+
+Create a program that:
+* Reads how many seconds was the calls duration
+* Calculates the monthly bill for the subscriber
+* Prints the total amount
+* Output: "total amount: 48$"
+
+#### Notice that that the charge for the first 500 seconds it's 0,01$ then for the next 501 to 800 seconds
+ it's 0,008 and then it's 0,005$
+ """
+
+def calculate_montly_bill (calls_duration):
+    fixed_cost = 25
+    if calls_duration == 0:
+        bill = fixed_cost
+    elif calls_duration in range(1, 500):
+        bill = (calls_duration * 0.01) + fixed_cost
+    elif calls_duration in range(501, 800):
+        diff1 = calls_duration - 500            #where diff1 represents the next tier 501-800 sec
+        bill = (diff1 * 0.008) + (500 * 0.01) + fixed_cost
+    else:
+        diff2 = calls_duration - 800
+        bill = (diff2 * 0.005) + (300 * 0.008) + (500 * 0.01) + fixed_cost
+    return bill
+
+seconds_duration = 800
+amount = calculate_montly_bill (seconds_duration)
+print(f"Total amount {amount}")
+
+
+
+
diff --git a/solution16.py b/solution16.py
new file mode 100644
index 0000000..71295d4
--- /dev/null
+++ b/solution16.py
@@ -0,0 +1,30 @@
+"""
+# ex.16
+A fast food chain has these meals
+
+| Meal | Price  |
+|---------|--------------|
+| Burger | 5$ |
+| Pizza | 3$ |
+| Hot Dog | 1,5$ |
+
+Create a program that:
+* Reads the meal the customer wants
+* Prints the cost of the meal
+* Input example: "Hot Dog"
+* Output: "Hot Dog 1,50$"
+"""
+
+#Solution using dictionary:
+
+def menu_price(menu_dict, meal_item):
+    if meal_item in menu_dict.keys():
+        return meal_item, menu_dict[meal_item]
+    else:
+        return("This item is not in the menu")
+
+dict_meals = {"Burger": "5$","Pizza": "3$", "Hot Dog": "1.50$"}
+food = "Caterpillar"
+
+cost = menu_price(dict_meals, food)
+print(cost)
diff --git a/solution17.py b/solution17.py
new file mode 100644
index 0000000..e46a000
--- /dev/null
+++ b/solution17.py
@@ -0,0 +1,15 @@
+"""
+# ex.17
+Create a program that:
+* Calculates the sum of 1+2+3+4...+98+99
+* Prints the sum of 1+2+3+4...+98+99
+* Output: "The sum is 4950"
+"""
+
+def sum_of_natural_numbers(last_number):
+    sum = last_number* (1 + last_number) / 2
+    return int(sum)
+
+num = 99
+result = sum_of_natural_numbers(num)
+print(f"The sum is {result}")
diff --git a/solution18.py b/solution18.py
new file mode 100644
index 0000000..5720a37
--- /dev/null
+++ b/solution18.py
@@ -0,0 +1,17 @@
+"""
+# ex.18
+* Calculates the sum of 1+3+5+7...+99+101
+* Prints the sum of 1+3+5+7...+99+101
+* Output: "The sum is 2601"
+"""
+
+def arithmetic_series(first_term, last_term, difference):
+    number_term = (last_term - first_term)/difference + 1
+    sum = (number_term)/2 * (first_term + last_term)
+    return int(sum)
+
+a = 1
+an = 101
+d = 2
+result = arithmetic_series(a, an, d)
+print(f"The sum is {result}")
\ No newline at end of file
diff --git a/solution19.py b/solution19.py
new file mode 100644
index 0000000..4ff478f
--- /dev/null
+++ b/solution19.py
@@ -0,0 +1,27 @@
+"""
+# ex.19
+Create a program that reads a number that you want to get the sum until that number
+
+Create a program that:
+* Reads the number you want to sum
+* Calculates the sum of 1+2+3+4...+98+99+n
+* Prints the sum of 1+2+3+4...+98+99+n
+* Input example: 100
+* Output: "The sum is 5050"
+
+###### Try the program with a very very big number, [if it takes too long check this 
+out](http://mathcentral.uregina.ca/qq/database/qq.02.06/jo1.html)
+"""
+from timeit import default_timer as timer
+
+start = timer()
+def sum_of_natural_numbers(last_number):
+    sum = last_number* (1 + last_number) / 2
+    return int(sum)
+
+num = 2000000202020202020202020202
+result = sum_of_natural_numbers(num)
+print(f"The sum is {result}")
+stop = timer()
+print(stop-start)
+
diff --git a/solution2.py b/solution2.py
new file mode 100644
index 0000000..d653b22
--- /dev/null
+++ b/solution2.py
@@ -0,0 +1,26 @@
+"""
+# ex.2
+It's the end of the semester and you got your grades from three classes: Geometry, Algebra, and Physics.
+
+Create a program that:
+1) Reads the grades of these 3 classes (Grades range from 0 - 10)
+2) Calculate the average of your grades
+
+* Example: Geometry = 6, Algebra = 7, Physics = 8
+* Output: average_score = 7
+"""
+
+def subjects_dict(dict1):
+    sum1 = sum(dict1.values())
+    average = sum1/3
+    return average
+
+geo = 6
+alg = 7
+phy = 8
+
+dict2 = {"Geometry" : geo, "Algebra" : alg, "Physics" : phy}
+
+result = subjects_dict(dict2)
+print(f"Your scores are Geometry: {geo}, Algebra: {alg}, Physics: {phy}")
+print("Your average score is", result)
diff --git a/solution20.py b/solution20.py
new file mode 100644
index 0000000..fa56e8a
--- /dev/null
+++ b/solution20.py
@@ -0,0 +1,23 @@
+"""
+# ex.20
+Create a program that reads a number that you want to get the sum until that number and 
+then calculate the averge of these numbers
+
+Create a program that:
+* Reads the number you want to sum
+* Calculates the sum of 1+2+3+4...+98+99+n
+* Calculates the average of the sum 1+2+3+4...+98+99+n
+* Input example: 100
+* Output: "The average is 50.5"
+"""
+
+
+def sum_avg_of_natural_numbers(last_number, n):
+    sum = last_number* (1 + last_number) / 2
+    avg = (sum + n)/2 
+    return int(avg)
+
+num = 99
+x = 100
+result = sum_avg_of_natural_numbers(num, x)
+print(f"The average is {result}")
\ No newline at end of file
diff --git a/solution21.py b/solution21.py
new file mode 100644
index 0000000..964a228
--- /dev/null
+++ b/solution21.py
@@ -0,0 +1,20 @@
+"""
+# ex.21
+Create a program that reads 5 numbers and find the average of these numbers
+
+Create a program that:
+* Reads the 5 numbers you want
+* Calculates the average of these numbers
+* Input example: 4, 6, 1, 4, 9
+* Ouput: "the average is 4.8"
+"""
+
+def list_of_numbers(list1):
+    sum_list1 = sum(list1)
+    length = len(list1)
+    avg = sum_list1/length
+    return int(avg)
+
+list2 = [1, 2, 3, 4, 5]
+average = list_of_numbers(list2)
+print("The average is", average)
diff --git a/solution22.py b/solution22.py
new file mode 100644
index 0000000..114e42b
--- /dev/null
+++ b/solution22.py
@@ -0,0 +1,25 @@
+"""
+# ex.22
+Create a program that reads 5 numbers and prints if the number is negative or positive
+
+Create a program that:
+* Reads the 5 numbers you want
+* Print if a number is negative or positive
+* Input example: 4, 6, -11, -4, 9
+* Ouput: "Positive", "Positive", "Negative", "Negative", "Positive",
+"""
+
+def sign_of_number(list1):
+    for num in list1:
+        if num > 0:
+            x = print ("Positive")
+        elif num < 0:
+            x = print ("Negative")
+        else:
+            x = print ("Zero")
+    
+        
+list2 = [-2, 4, 5, 0, -5.9]
+number_sign = sign_of_number(list2)
+
+
diff --git a/solution23.py b/solution23.py
new file mode 100644
index 0000000..e7b5a9b
--- /dev/null
+++ b/solution23.py
@@ -0,0 +1,24 @@
+"""
+# ex.23
+Create a program that reads numbers and sum them until the user inputs a negative value
+
+Create a program that:
+* Reads numbers
+* Sum them
+* Prints the sum
+* Input example: 5, 9, 3, 0, 2, 0, 4, -7
+* Output: "The sum is 23"
+"""
+
+
+def add_until_negative(list1):
+    sum = 0
+    for num in list1:
+        if num < 0:
+            break
+        sum += num  
+    return sum
+
+list_of_given_numbers = [5, 9, 3, 0, 2, 0, 4, -7]
+result = add_until_negative(list_of_given_numbers)
+print(result)
diff --git a/solution24.py b/solution24.py
new file mode 100644
index 0000000..8017254
--- /dev/null
+++ b/solution24.py
@@ -0,0 +1,23 @@
+"""
+# ex.24
+Create a program that reads numbers and sum them until the user inputs a negative value or zero value
+
+Create a program that:
+* Reads numbers
+* Sum them
+* Prints the sum
+* Input example: 5, 9, 3, 7, 0
+* Output: "The sum is 24"
+"""
+
+def sum_of_given_numbers(list_numbers):
+    sum = 0
+    for num in list_numbers:
+        if num <= 0:
+            break
+        sum += num
+    return sum
+
+given_numbers = [1, 5, 5.8, 9, 0, -3, -5, 8]
+result = sum_of_given_numbers(given_numbers)
+print(result)
diff --git a/solution25.py b/solution25.py
new file mode 100644
index 0000000..ecfb8b1
--- /dev/null
+++ b/solution25.py
@@ -0,0 +1,39 @@
+"""
+# ex.25
+You start flipping a coin, count and print how many times the result was head or tails until you enter the word 
+"stop". Then find and print the percentage of how many head or tails was the result.
+
+Create a program that:
+* Reads if the flipped coin was head or tails
+* If the value is "stop", print proper message and quit program
+* While value not "stop", count the result
+* Print the proper message
+* Calculates the percentage of head and tails
+* Prints the proper message
+* Input: "head", "tails", "tails", "tails", "head", "head", "tails", "tails", "tails", "head"
+* Ouput: "Head won 4 times and tails won 6 times"
+* Output: "40% Head, 60% Tails"
+"""
+
+def read_flip(flip_result_list):
+    count_heads = 0
+    count_tails = 0
+    for item in flip_result_list:
+        if item == "head":
+            count_heads += 1
+        elif item == "tails":
+            count_tails += 1
+        else:
+            item == "stop"
+            break
+    total_flips = count_heads + count_tails
+    percentage_heads = (count_heads/total_flips) * 100
+    percentage_tails = (count_tails/total_flips) * 100
+    return count_heads, count_tails, percentage_heads, percentage_tails, total_flips
+
+list_flips = ["head", "tails", "tails", "tails", "head", "head", "tails", "tails", "tails", "head", "stop"]
+heads, tails, perc_heads, perc_tails, total = read_flip(list_flips)
+print(f"The coin flipping was stopped after {total} flips")
+print(f"Head won {heads} times and tails won {tails} times")
+print(f"{perc_heads}% Head, {perc_tails}% tails")
+
diff --git a/solution26.py b/solution26.py
new file mode 100644
index 0000000..c6a0b02
--- /dev/null
+++ b/solution26.py
@@ -0,0 +1,53 @@
+"""
+# ex.26
+-Create a program that read values of apartments you want to rent until the inpute value is 0 or 
+a negative number.
+-You will calculate the average price for rent and how many apartments you've registered. Print 
+the proper message.
+-Then compare values of apartments you want to rent with the avarage price of the apartments 
+you've registered until you enter 0 or a negative value.
+-If the price is above average price print the proper message, else if the price is below average
+ print the proper message. If the input value is 0 or a negative number, print the proper message and exit.
+
+Create a program that:
+* Reads values until user inputs 0 or a negative value
+* Calculates the average price
+* Counts how many apartments registered
+* Prints the average price and how many apartments registered
+* Reads prices and compare with the average price and print proper message
+* Input: 234, 764, 123, 654
+* Output: "4 apartments have registed. The average price for rent is 443.75$"
+* Input: 500, 200, 350, 450, 0, -7
+* Output: "Above average price", "Above below price", "Above below price", "Above average price", "Quit Program","Quit Program"
+"""
+
+def apartment_values_list(list_values):
+    total_apartment_rent = 0
+    rents_greater_than_zero = 0
+    number_of_registered_apts = len(list_values)
+    list_info_on_rents = []
+    for value in list_values:
+        if value != 0 and value > 0:
+            total_apartment_rent += value
+            rents_greater_than_zero += 1
+            avg_rent = total_apartment_rent/rents_greater_than_zero
+        else:
+            break
+    for value in list_values:
+        if value > avg_rent:
+            response = "Above average price"
+        elif value < avg_rent and value > 0:
+            response = "Below average price"
+        else:
+            response = "Quit Program"
+        list_info_on_rents.append(response)
+
+    return number_of_registered_apts, avg_rent, list_info_on_rents
+
+list_apts = [500, 200, 350, 450, 0, -7]
+number, average, info = apartment_values_list(list_apts)
+print(f"{number} apartments have registed. The average price for rent is {average}$")
+print(info)
+      
+
+
diff --git a/solution27.py b/solution27.py
new file mode 100644
index 0000000..d542bc6
--- /dev/null
+++ b/solution27.py
@@ -0,0 +1,39 @@
+"""
+# ex.27
+Create a program that register a user with a username and a password. Then the user will try to login with the login 
+credentials. If the user make 3 wrong attempts exit program with proper message.
+
+Create a program that:
+* Reads the username and the password
+* Then the user try to login
+* If the user makes 3 wrong attempts exit with proper message
+"""
+
+def login_info(username, password):
+    dict_login_info = {}
+    dict_login_info[username] = password
+    return dict_login_info
+
+ask_username = input("Enter your username: ")
+ask_password = input("Enter your password: ")
+info_client_dict = login_info(ask_username, ask_password)
+
+attempts = 0
+max_attempts = 3
+
+while attempts < max_attempts:
+    ask_username_again = input("Enter your username: ")
+    ask_password_again = input("Enter your password: ")
+     
+    if ask_username_again in info_client_dict and info_client_dict[ask_username_again] == ask_password_again:
+        print("Welcome back")
+        break
+    else:
+        print("Try again")
+        attempts += 1
+        
+
+else: 
+    print("Sorry, your login failed")
+    exit()
+    
\ No newline at end of file
diff --git a/solution28.py b/solution28.py
new file mode 100644
index 0000000..1f23bfa
--- /dev/null
+++ b/solution28.py
@@ -0,0 +1,26 @@
+"""
+# ex.28
+Create a program that asks the user for seconds(integers values) and then start printing the countdown, 
+when the countdown ends print Go!. If the user enters a non integer value, exit the program with proper message.
+
+Create a program that:
+* Reads integers until user enters a non integer value.
+* Print the countdown and at the end print Go!
+* Input: 3, -7
+* Output: 3, 2, 1, Go! - Exit Program
+"""
+
+def input_seconds(list1):
+    output_list = []
+    for i in list1:
+        if type(i) == int:
+            output_list.append(i)
+        else:
+            output_list.append("Go")
+            break
+    return output_list
+    
+input_list = [3, 5, 7, 0, -3, 3.4, "sally", 6, 9]
+result = input_seconds(input_list)
+print(result)
+
diff --git a/solution3.py b/solution3.py
new file mode 100644
index 0000000..ac59f45
--- /dev/null
+++ b/solution3.py
@@ -0,0 +1,29 @@
+""" ex.3
+You've bought a Bitcoin and now it's on the rise!!!
+
+Create a program that:
+1) Reads the value of the bitcoin at the time of purchase
+2) Reads the percentage of increase (or decrease)
+3) Prints the total value of your bitcoin
+4) Prints the increase or decrease value
+
+* Example: bitcoin_value = 10000, bitcoin_increase = 10
+* Output: total_bitcoin_value = 11000, bitcoin_increase_value = 1000
+"""
+
+def bitcoin_value(value_of_bitcoin_at_purchase, percentage_change, type_of_change):
+    change_in_value = (percentage_change/100) * value_of_bitcoin_at_purchase
+    if type_of_change == "increase":
+        total_value_of_bitcoin = value_of_bitcoin_at_purchase + change_in_value
+    else:
+        total_value_of_bitcoin = value_of_bitcoin_at_purchase - change_in_value
+    return total_value_of_bitcoin, change_in_value, type_of_change
+
+bought_bitcoin_at = 20000
+percentage_diff = 10
+increase_or_decrease = "decrease"
+x, y, z = bitcoin_value(bought_bitcoin_at, percentage_diff, increase_or_decrease)
+
+print(f"The total value of your Bitcoin is ${x}")
+
+print(f"The {z} in Bitcoin since last year is ${y}")
diff --git a/solution4.py b/solution4.py
new file mode 100644
index 0000000..85fc029
--- /dev/null
+++ b/solution4.py
@@ -0,0 +1,29 @@
+"""ex.4
+You now own some property and you want to calculate the total area of the property.
+
+Create a program that:
+1) Reads the width and height
+2) Prints the area
+
+* Example: width = 5, height = 2
+* Output: total_area = 10  """
+
+def dimensions_of_property(shape, base, height):
+    if shape == "Triangle":
+        area = 0.5 * base * height
+    elif shape == "Rectangle":
+        area = base * height
+    elif shape == "Square":
+        area = base * height
+    elif shape == "Parallelogram":
+        area = base * height
+    else:
+        area = print("System cannot determine area for that shape")
+    return area
+
+property_shape = "Rectangle"
+b = 7
+h = 8
+
+result = dimensions_of_property(property_shape, b, h)     
+print(result)
\ No newline at end of file
diff --git a/solution5.py b/solution5.py
new file mode 100644
index 0000000..410972e
--- /dev/null
+++ b/solution5.py
@@ -0,0 +1,30 @@
+"""
+# ex.5
+You are interested in buying crypto-currencies. You want to check the current amount of money you have and see how many coins you can buy in Bitcoin, Ethereum, and Litecoin.
+
+Create a program that:
+1) Reads the total amount of money you have
+2) Reads the price of Bitcoin, Ethereum, and Litecoin
+3) Prints the amount of Bitcoin, Ethereum, and Litecoin you can buy
+
+* Example: money = 100, bitcoin_price = 50, ethereum_price = 25, litecoin_price = 10
+* Output: "With 100$ you can buy: 2 Bitcoins, 4 Ethereum, and 10 Litecoins"
+
+(Warning! Τhe prices are made up for exercise purposes) """
+
+def stocks_you_can_buy(money, bitcoin, ethereum, litecoin):
+    if money != 0:
+        num_bitcoin = money // bitcoin
+        num_ethereum = money // ethereum
+        num_litecoin = money // litecoin
+    else:
+        None
+    return num_bitcoin, num_ethereum, num_litecoin
+
+available_money = 800
+price_bitcoin = 80
+price_ethereum = 30
+price_litecoin = 20
+
+b, e, l = stocks_you_can_buy(available_money, price_bitcoin, price_ethereum, price_litecoin)
+print(f"With ${available_money}, you can buy {b} Bitcoins, {e} ethereums, and {l} litecoins.")
\ No newline at end of file
diff --git a/solution6.py b/solution6.py
new file mode 100644
index 0000000..0cd664d
--- /dev/null
+++ b/solution6.py
@@ -0,0 +1,18 @@
+"""You are interested in buying a new laptop. You check the price and you see that the price is 300$ without the 10% tax.
+
+Create a program that:
+1) Reads the price of the laptop
+2) Reads the tax percentage
+3) Prints the total amount
+
+* Output: "The total price of the laptop is 330$"  """
+
+def calculate_total(price_of_laptop, tax_percent):
+    tax_value = (tax_percent/100) * price_of_laptop
+    total_value = price_of_laptop + tax_value
+    return total_value
+
+laptop = 1000
+tax = 6.5
+total = calculate_total(laptop, tax)
+print("The total price of the laptop is ",total)
diff --git a/solution7.py b/solution7.py
new file mode 100644
index 0000000..7ca1e60
--- /dev/null
+++ b/solution7.py
@@ -0,0 +1,25 @@
+
+""" ex.7
+In a company the monthly salary of an employee is calculated by: the minimum wage 400$ per month, plus 20$ multiplied 
+by the number of years employed, plus 30$ for each child they have.
+
+Create a program that:
+1) Reads the number of years employed
+2) Reads the number of children the employee has
+3) Prints the total amount of salary the employee makes
+
+* Output: "The total amount is 560$. 400$ minimum wage + 100$ for 5 years experience + 60$ for 2 kids"  """
+
+def calculate_salary(years_employed, num_children):
+    minimum_wage = 400
+    money_for_experience = years_employed * 20
+    benefits_for_children = num_children * 30
+    monthly_salary = minimum_wage + money_for_experience + benefits_for_children
+    return monthly_salary, money_for_experience, benefits_for_children
+
+years = 20
+children = 3
+s, y, c = calculate_salary(years, children)
+print(f"The total amount is ${s}. 400$ minimum wage + {y}$ for 20 years experience + {c}$ for 3 kids")
+
+
diff --git a/solution8.py b/solution8.py
new file mode 100644
index 0000000..32c03c0
--- /dev/null
+++ b/solution8.py
@@ -0,0 +1,29 @@
+"""ex.8
+The exercise is almost identical to a previous exercise with a minor change. In a company the monthly salary of an employee is calculated by minimum wage
+ 400$ per month, plus 20$ multiply by the employment years, plus 30$ for each employee kid, plus 100$ if the employee didn't miss 1 day of work.
+
+Create a program that:
+* Reads the employment years
+* Reads the number of each employee kids
+* Prints the total amount the employee must take
+* Output: "The total amount is 660$, 400$ minimum wage + 100$ for 5 years experience + 60$ for 2 kids + 100$ for not missing a day at work"
+"""
+
+def calculate_salary(years_employed, num_children, missed_days):
+    minimum_wage = 400
+    money_for_experience = years_employed * 20
+    benefits_for_children = num_children * 30
+    monthly_salary = minimum_wage + money_for_experience + benefits_for_children
+    bonus = 100
+    if missed_days == 0:
+        monthly_salary += bonus
+    return monthly_salary, money_for_experience, benefits_for_children
+
+years = 20
+children = 3
+holidays = 0
+s, y, c = calculate_salary(years, children, holidays)
+if holidays == 0:
+    print(f"The total amount is ${s}. 400$ minimum wage + {y}$ for 20 years experience + {c}$ for 3 kids + $100 for not missing a day at work")
+else:
+    print(f"The total amount is ${s}. 400$ minimum wage + {y}$ for 20 years experience + {c}$ for 3 kids")
diff --git a/solution9.py b/solution9.py
new file mode 100644
index 0000000..9d95541
--- /dev/null
+++ b/solution9.py
@@ -0,0 +1,30 @@
+"""
+ex.9
+The exercise is almost identical to a previous exercise with a minor change. It's the end of the semester and you got your marks from, Geometry, Algebra,
+ Physics classes. If the average score is 7 and above print "Good job!", if the average score is between 6 and 4 print "You need to work harder!",
+   if the average score is below 4 print "Failed, you really need to work harder!".
+
+Create a program that:
+* Reads the values of these 3 lessons
+* Calculate the average of your grades
+* Example: Geometry = 6, Algebra = 7, Physics = 8
+* Output: Your average score is 7, Good job!"
+"""
+
+def subjects_scores(geometry, algebra, physics):
+    sum1 = geometry + algebra + physics
+    average = sum1/3
+    return average
+
+geo = 6
+alg = 2
+phy = 3
+
+avg_score = subjects_scores(geo, alg, phy)
+
+if avg_score >= 7:
+    print("Good job!")
+elif 6 >= avg_score >= 4:
+    print("You need to work harder!")
+else:
+    print("Failed, you really need to work harder!")