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modular programming

You need to change the coffee bar POS program to apply the 10%
discount to everything that’s sold. You have three tasks.

1 Start by creating a new module called promotion.py containing
one function:

def discount(price):

2 Complete the code in the above function so that it returns 90% of the price it is
given.

3 This is the latest version of the coffee_pos.py module. Modify it so that it
uses the new module to cut the price of everything that’s sold.

from transactions import *

items = ["DONUT", "LATTE", "FILTER", "MUFFIN"]
prices = [1.50, 2.20, 1.80, 1.20]
running = True

while running:
option = 1
for choice in items:
print(str(option) + ". " + choice)
option = option + 1
print(str(option) + ". Quit")
choice = int(input("Choose an option: "))
if choice == option:
running = False
else:
credit_card = input("Credit card number: ")
save_transaction(prices[choice - 1], credit_card, items[choice - 1])

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