Rahim bought 65 books for Rs.6500 from one shop and 35 books for Rs.2000 from another. What is the average price he paid per book ?  Pick one.
A) 80  B) 138  C) 100  D) 129  E) 85

Rationale: "average price per book = ( 6500 + 2000 ) / ( 65 + 35 ) = 8500 / 100 = rs . 85 answer : e"
Answer: E