Discussion
A swimming pool is 20 m in length, 15 m in breadth and 4 m in depth. What is the cost of plastering its floor and walls at ₹ 42 per m2 ?
Answer: D
The cost is ₹ 24,360.
The pool is open at the top, so plaster the floor and the four walls.
\[ \begin{aligned} \text{Floor} &= 20 \times 15 = 300\ \text{m}^2 \\ \text{Walls} &= 2(20 + 15) \times 4 = 280\ \text{m}^2 \\ \text{Total} &= 580\ \text{m}^2 \end{aligned} \]
\[ 580 \times 42 = 24360 \]
The other options correspond to areas of 590, 600 and 578 m2, none of which is the floor plus the four walls. Plastering the top as well as the floor would give 880 m2, far more than any option.
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