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Justine spends $122 to create a lemonade stand. If she sells p cups of lemonade at $2.50 per cup, which of the following expressions represents her profits after expenses?
A. p + 122
B. 2.5 - p
C. 2.5p - 122
D. p - 122
Justine sells p cups of lemonade for $2.50 per cup. So her total sale is $2.50 x p = $.250p. The cost was $122, so the profit is sale = cost = 2.5p - 122.
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