Discussion :: Area
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A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq. m, is:
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Answer : Option C
Explanation :
| Area to be plastered | = [2(l + b) x h] + (l x b) |
| = {[2(25 + 12) x 6] + (25 x 12)} m2 | |
| = (444 + 300) m2 | |
| = 744 m2. |
Cost of plastering = Rs.[744 x \( \frac { 75 } { 100 } \)] =Rs. 558.
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