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The school wishes to purchase 2500 pens and have discovered that 3 stores sell the same model pen.Which store has the best buy ? Store A sells 15 pens for $0.50, Store B sells 50 pens for $ 1.70 and Store C sells 30 pens for $0.90

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Store\ A: (0.5)/(15)=0.0333\ cents\ per\ pen \\ \\ Store\ B: (1.7)/(50)=0.034\ cents\ per\ pen \\ \\ Store\ C: (0.9)/(30) =0.03\ cents\ per\ pen \\ \\ Store\ C\ is\ the\ cheapest.
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