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    • Question

      A tank is 25 m long, 12 m wide and 6 m deep. The cost

      (in ₹) of plastering its walls and bottom at ₹10 per m² is:
      A 11,160 Correct Answer Incorrect Answer
      B 12,500 Correct Answer Incorrect Answer
      C 6,275 Correct Answer Incorrect Answer
      D 7,440 Correct Answer Incorrect Answer

      Solution

      Calculation surface area of tank = 2(25 × 12 + 12 × 6 + 6 × 25) - 25 × 12 =2(300 + 72 + 150) - 300 =2 (522) -300 =1044-300 =744 Cost of plastering the tank = 744 x 10 = 7440 The cost (in Rs) of plastering its walls and bottom at Rs. 10 per m² is 7440

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