Can you find mistake in my code?

Question

menu = {"Pizza":6,
"Nachos":6,
"Cheeseburger":10,
"Water":4,
"Coke":5}

order = input().split()
bill = 0

for i in order:
if i in menu:
bill += menu[i]
else:
bill += menu["Coke"]

print(bill*(1.07))

Answer 1

Output should be rounded to 2 decimals.
print(round(bill*(1.07),2))

Answer 2

What's the task?
Why do you add "Coke" if I is not in menu?

Answer 3

Lisa here is the task

You and three friends go to a baseball game and you offer to go to the concession stand for everyone. They each order one thing, and you do as well. Nachos and Pizza both cost $6.00. A Cheeseburger meal costs $10. Water is $4.00 and Coke is $5.00. Tax is 7%.

Task
Determine the total cost of ordering four items from the concession stand. If one of your friend’s orders something that isn't on the menu, you will order a Coke for them instead.

Input Format
You are given a string of the four items that you've been asked to order that are separated by spaces.

Output Format
You will output a number of the total cost of the food and drinks.

Sample Input
'Pizza Cheeseburger Water Popcorn'

Sample Output
26.75

Answer 4

I think it's something about the taxes.

Is there any hint if they apply to all items on the menu the same?