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      Question

      A rectangular room measures 25 metres in length and has

      a perimeter of 78 metres. Calculate the total cost to carpet this room at a rate of Rs. 8 per square metre.
      A Rs. 2800 Correct Answer Incorrect Answer
      B Rs. 3200 Correct Answer Incorrect Answer
      C Rs. 2640 Correct Answer Incorrect Answer
      D Rs. 2120 Correct Answer Incorrect Answer

      Solution

      Let the breadth of the floor = 'b' metres Then, perimeter of the floor = 2 x (25 + b) = 78 So, b = (78/2) - 25 = 14 So, area of the floor = 25 x 14 = 350 m2 So, cost of carpeting the floor = 350 x 8 = Rs. 2800 Hence, option a.

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