A tank is 25 metres long, 12 metres wide, and 6 metres deep. At 75 paise per sq. m, the cost of plastering its walls and bottom is:
A. Rs. 456
B. Rs. 458
C. Rs. 558
D. Rs. 568
Answer:C
A tank is 25 metres long, 12 metres wide, and 6 metres deep. At 75 paise per sq. m, the cost of plastering its walls and bottom is:
A. Rs. 456 B. Rs. 458 C. Rs. 558 D. Rs. 568
Explanation: [2(l + b) x h] + (l x b) = [2(25 + 12) x 6] + (25 x 12) Area to be plastered (444 + 300) m2, 744 m2.Plastering costs Rs. 744 x 75/100 = Rs. 558.