Eric has 10 one-dollar bills, 5 five-dollar bills, 5 ten-dollar bills, and 9 twenty-dollar bills. He wants to pay a bill of $99 at the grocery store and get no change. Which bills should he give the cashier?
(4*20) + 10 + 5 + 4 = 99
(3*20 + (3*10) + 5 + 4 = 99
There are other combinations.