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      Question

      Aarav bought a device for Rs. 2800 and spent some money

      on installation. He marked up the price by 25%, gave a Rs. 320 discount, and still earned a 15% profit. Find the installation cost.
      A Rs 320 Correct Answer Incorrect Answer
      B Rs 400 Correct Answer Incorrect Answer
      C Rs 500 Correct Answer Incorrect Answer
      D Rs 300 Correct Answer Incorrect Answer

      Solution

      Let installation cost = Rs. x
      Effective cost = 2800 + x
      Marked Price = 1.25(2800 + x)
      Selling Price = Marked – 320 = 1.15(2800 + x)
      1.25(2800 + x) – 1.15(2800 + x) = 320
      0.10(2800 + x) = 320
      2800 + x = 3200
      x = Rs. 400

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