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how can the clerk make the change of the \$1 bill using the fewest number of coins?

Two 50-cent pieces.

Is there more to this problem?

in book one side they say carlo had to buy on can of food because he ran out. he went to the store and bought a \$0.79 can of food. he paid with a \$ 1 bill. how much change did he get? ( this is different one in one question they put 5 parts in one question)

no

What is the least number of coins that make up \$0.21?

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