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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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