The C.P of 8 books is equal to the S.P of 16 books. Find his gain% or loss%?
Choose the correct option
A) 60 %	B) 50 %	C) 70 %	D) 90 %	E) 55 %

Rationale: "explanation : 8 cp = 16 sp 16 - - - 8 cp loss 100 - - - ? = > 50 % loss answer : b"
Answer: B