# Making Change for a Purchase

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Suppose you work in an old-fashioned country general store without a newfangled computerized cash register. You have to work out the change for a purchase in your head. The "Change" display turns red when you select the right amount.

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Here's how to do it. Suppose the purchases total \$5.33 and the customer hands you a \$10 bill. Imagine adding 2¢ to the \$5.33 to get \$5.35; then add 5¢ to bring the total to \$5.40; 10¢ to get to \$5.50; 50¢ (or 2 quarters) to get to \$6.00; and finally add four \$1 bills. This adds up to a total change of \$4.67.

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Contributed by: S. M. Blinder (March 2011)
Open content licensed under CC BY-NC-SA

## Permanent Citation

S. M. Blinder

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