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      Question

      John bought a watch for Rs. 3,400 and sold it at a

      profit percentage equal to the profit percentage earned on selling 10 bicycles for the cost price of 15 bicycles. Find the selling price of the watch.
      A Rs.5,100 Correct Answer Incorrect Answer
      B Rs.2,000 Correct Answer Incorrect Answer
      C Rs.2,200 Correct Answer Incorrect Answer
      D Rs.6,000 Correct Answer Incorrect Answer
      E none of these Correct Answer Incorrect Answer

      Solution

      ATQ, Let the cost price of 1 bicycle = Rs. 100. Therefore, the cost price of 10 bicycles = Rs. 1,000. The selling price of 10 bicycles (which is the cost price of 15 bicycles) = Rs. 1,500. Profit on bicycles = Rs. 1,500 - Rs. 1,000 = Rs. 500. Profit % = 500/1000 × 100 = 50% Therefore, the selling price of the watch = 1.50 × 3400 = Rs.5,100

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