Rahim bought 65 books for Rs.1150 from one shop and 50 books for Rs.920 from another. What is the average price he paid per book ?	Select.
A) rs . 17  B) rs . 18  C) rs . 12  D) rs . 11  E) rs . 10

Rationale: "average price per book = ( 1150 + 920 ) / ( 65 + 50 ) = 2070 / 115 = rs . 18 answer : b"
Answer: B