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A rectangular water tank is open at the top. Its capacity is 24Cu.m.It's length and breadth are 4m and 3m respectively. Ignoring the thickness of the material used for building the tank the total cost of painting the inner and outer surface of the tank at Rs. 10 per Sq.m is_________?

Correct answer: D. Rs.800

  • A. Rs.400
  • B. Rs.500
  • C. Rs.600
  • D. Rs.800

Explanation

The tank height is capacity ÷ base area = 24 m3 ÷ (4 m × 3 m) = 2 m. One open tank surface, including its bottom and four sides, is 4 m × 3 m + 2(4 m × 2 m) + 2(3 m × 2 m) = 40 m2; painting both inner and outer surfaces gives 80 m2. Cost = 80 m2 × Rs. 10 per m2 = Rs. 800. The likely wrong choice is Rs. 400, which counts only one of the inner or outer surfaces.

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