When you buy something and pay for it with bills or coins, you are paying【B1

When you buy something and pay for it with bills or coins, you are paying cash.
    If you don’t have a combination of bills and coins that exactly equals the price of the item, you may give the salesperson too much money. He or she will then give some money back to you. The money you get back is called change. Look at this example.
    Your husband is buying a color television set. The total price is $244.90. He gives the salesman $250.00— two hundred-dollar bills and one fifty-dollar bill. The salesman gives him back a five-dollar bill and a dime. Your husband’s change is $5.10.