Rahim bought 27 books for Rs.581 from one shop and 20 books for Rs.594 from another. What is the average price he paid per book ?
Select the correct option
A) 28	B) 18	C) 27	D) 25	E) 21

Rationale: "average price per book = ( 581 + 594 ) / ( 27 + 20 ) = 1175 / 47 = rs . 25 answer : d"
Answer: D