Discussion
A swimming pool that is 24 m long 12 m wide and 3 m deep will have its bottom and its sides tiled. If the cost of tiling 1 m3 is Rs.750, what will be the total cost (in Rs.) incurred in tiling the pool?
Answer: A
The total cost is Rs. 3,78,000.
The bottom is 24 × 12 = 288 m2. The sides are the four walls: 2(24 + 12) × 3 = 216 m2. The tiled area is 504 m2. The printed rate is Rs. 750 per square metre (the question says m3, which is a slip).
\[ 504\times750=378000 \]
5,94,000 and 5,88,000 would include the top surface, and 3,96,000 does not come from these areas.
The pool is open at the top, so only the bottom and four walls are tiled. The long walls are 24 × 3 × 2 = 144 and the short walls are 12 × 3 × 2 = 72, so the walls are 216 m squared. With the bottom, 288, the total area is 504 m squared.
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