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Question

If the cost price of 15 pens is equal to the selling price of 20 pens . Find the profit or loss percent ?

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Solution

Let the CP of each pen be Rs x.CP of 20 pens=Rs20xSP of 20 pens=CP of 15 pens=Rs15xi.e CP>SPNow, Loss=CP-SP=20x-15x=5xSo, Loss percentage=LossCP×100=5x20x×100=25%

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