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:

A. Rs. 456 B. Rs. 458
C. Rs. 558 D. Rs. 568

• 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 (75/100)= Rs. 558.
  
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