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2014-09-09T18:35:08+05:30

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Shop keeper's Selling price SP = (100+ profit% )/100 * Cost Price = Rs 840
cost price = Rs 840 * 100 / 120 = Rs 700

Cost price of 2nd transistor = Rs 700 + Rs 25 = Rs 725
Profit = same as that for the first transistor = 20%

Selling  price = (100 + profit% )/100 *Cost price = 120/100 * 725
                     =  Rs 870

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