A tank is 25m long 12m wide and 6m deep. The cost of plastering its walls and bottom at 75 paise per sq m is  Select the correct option:	A) Rs. 258	B) Rs. 358	C) Rs. 458	D) Rs. 558	E) None of these
Explanation:   Area to be plastered = [2(l + b) × h] + (l × b)   = [2(25 + 12) × 6] + (25 × 12) = 744 sq m   Cost of plastering = 744 × (75/100) = Rs.558 Answer: Rs. 558
<result>D</result>
A tank is 25m long 12m wide and 6m deep. The cost of plastering its walls and bottom at 75 paise per sq m is