Registers

You make your way over to the registers and your trainer is there waiting for you. She teaches you the basics of how to use the register and check people out. She reminds you of the importance of knowing how much each menu item costs and giving people back the correct change in a timely manner. Your first customer's total is $13.89. They hand you a $20 dollar bill. How much change do you give them?

6 ones, one quarter, and one nickel? or 6 ones, one dime, one penny?