Sandy bought 65 books for $1480 from one shop and 55 books for $920 from another shop. What is the average price that Sandy paid per book?  Choose the correct choice from the following answers.
A) $ 38 B) $ 18 C) $ 99 D) $ 27 E) $ 20

Rationale: "average price per book = ( 1480 + 920 ) / ( 65 + 55 ) = 2400 / 120 = $ 20 the answer is e ."
Answer: E