The C.P of 5 books is equal to the S.P of 20 books. Find his gain% or loss%? Choose the correct option.
A) 35 %	B) 20 %	C) 5 %	D) 25 %	E) 75 %

Rationale: "explanation : 5 cp = 20 sp 20 - - - 15 cp loss 100 - - - ? = > 75 % loss answer : e"
Answer: E