The total of 324 of 20 paise and 25 paise make a sum of Rs. 71. The no of 20 paise coins is
Choose the correct choice from the following answers.
A) 238  B) 277  C) 278  D) 200  E) 288

Rationale: "explanation : let the number of 20 paise coins be x . then the no of 25 paise coins = ( 324 - x ) . 0.20 * ( x ) + 0.25 ( 324 - x ) = 71 = > x = 200 . . answer : d ) 200"
Answer: D