The total of 324 of 20 paise and 25 paise make a sum of Rs. 71. The no of 20 paise coins is :
Pick one:
A) 50  B) 100  C) 150  D) 200  E) 250

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"
Answer: D