Buying Lunch

You are going to the amusement park. At the amusement park you will buy lunch. You don't want to carry coins, only dollar bills, because coins can fall out of your pocket on the rollercoaster. You can purchase any of the items on the menu, but you cannot buy more than one of the same item. Using the menu below find out how many different lunches you could buy without receiving any change back.

Hot dog $1.75
Hamburger $2.25
Cheeseburger $2.75
Chips $0.75
Nachos $1.50
French Fries $0.75
Soda $1.50
Water $1.25

Possible extension:

What combinations can you make if you have to buy a drink?

What combinations can you make if you only have $8 to spend?