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 Choose the correct choice:
A) rs . 258 B) rs . 358 C) rs . 458 D) rs . 558 E) none of these

Rationale: "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 : d"
Answer: D