Judy bought a quantity of pens in packages of 5 for $0.80 per package. She sold all of the pens in packages of 3 for $0.60 per package. If Judy’s profit from the pens was $8.00, how many pens did she buy and sell?
40
80
100
200
400
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此类题型基本都需要算出单价
此类题型基本都需要算出单价
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