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      Question

      The combined cost price of two watches, 'P' and 'Q',

      amounts to Rs. 1,250. Watch 'P' is sold for a 20% profit, while watch 'Q' achieves an 18% profit. Given that their total selling price reaches Rs. 1,490, calculate the disparity in their initial cost prices.
      A Rs. 150 Correct Answer Incorrect Answer
      B Rs. 400 Correct Answer Incorrect Answer
      C Rs. 350 Correct Answer Incorrect Answer
      D Rs. 250 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the cost price of watch 'P' be Rs. 'z'. So, cost price of watch 'Q' = Rs. (1,250 - z) ATQ: 1.2z + 1.18 X (1,250 - z) = 1,490 Or, 1.2z + 1,475 - 1.18z = 1,490 Or, 0.02z = 15 So, 'z' = 750 Cost price of watch 'Q' = 1,250 - 750 = Rs. 500 Therefore, required difference = 750 - 500 = Rs. 250

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