A tank is 25m long 12m wide and 6m deep. The cost of plastering its walls and bottom at 70 paise per sq m is Choose one
A) Rs. 258.80 B) Rs. 358.80 C) Rs. 458.80 D) Rs. 520.80 E) None of these
Explanation:   Area to be plastered = [2(l + b) Ã— h] + (l Ã— b)   = [2(25 + 12) Ã— 6] + (25 Ã— 12) = 744 sq m   Cost of plastering = 744 Ã— (70/100) = Rs.520.80 Answer: Rs. 520.80
<result>D</result>
A tank is 25m long 12m wide and 6m deep. The cost of plastering its walls and bottom at 70 paise per sq m is