Question

Joan bought a DVD for $21. She gave the cashier two $20 bills. How many different combinations of one dollar bills, five dollar bills, and $10 bills can the cashier give her for change?

Answer 1

There are six different combinations of one dollar bills, five dollar bills, and $10 bills that the cashier can give as change for $19.

Step-by-step explanation:

Joan bought a DVD for $21 and paid with two $20 bills, which means she gave $40. The cashier needs to give her $40 - $21 = $19 in change. Let's look at the combinations involving one dollar bills, five dollar bills, and $10 bills that the cashier can give her.

• One $10 bill, one $5 bill, and four $1 bills
• One $10 bill and nine $1 bills
• Three $5 bills and four $1 bills
• Two $5 bills and nine $1 bills
• One $5 bill and fourteen $1 bills
• Nineteen $1 bills

These are the possible combinations the cashier can use to give Joan $19 in change.