A tank is 25m long 12m wide and 6m deep. The cost of plastering its walls and bottom at 25 paise per sq m is Pick:
A) rs . 186
B) rs . 258
C) rs . 486
D) rs . 586
E) none of these

Rationale: "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 — ( 25 / 100 ) = rs . 186 answer : a"
Answer: A