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Zelma buys p pounds of bananas for 40 cents per pound. She pays the clerk with a twenty-dollar bill. The clerk subtracts the total cost of the bananas from the twenty-dollar bill to determine the amount of change to give Zelma. Which expression represents the amount of change Zelma should receive? Justify your choice

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Answer: c (change) = 20-0.4p (# of pounds of bananas Zelma buys)

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