[20] Product Price

price = float(input("Enter the product price: "))
product_amount = int(input("Enter the product amount: "))
day = input("What day it is? ")

if day.upper() in ("MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY"):
    total_price = product_amount * price
    print(f"The total price is {total_price}.")
elif day.upper() in ("SATURDAY", "SUNDAY"):
    total_price = (product_amount * price) * 0.85
    print(f"The total price is {total_price}.")
else:
    print("Error: The day you entered doesn't exist!")