The C.P of 20 books is equal to the S.P of 30 books. Find his gain% or loss%?
Choose the correct choice from the following answers:
A) 63.33%	B) 34.33%	C) 33.33%	D) 31.33%	E) 36.33%
explanation:   20 33.33%P = 30 SP   30 --- 10 33.33%P loss   100 --- ? =&gt; 33.33% loss   Answer: 33.33%
<result>C</result>
The C.P of 20 books is equal to the S.P of 30 books. Find his gain% or loss%?