The C.P of 5 books is equal to the S.P of 20 books. Find his gain% or loss%? Select:	A) 35%	B) 20%	C) 5%	D) 25%	E) 75%
explanation:   5 CP = 20 SP   20 --- 15 CP loss   100 --- ? =&gt; 75% loss   Answer: 75%
<result>E</result>
The C.P of 5 books is equal to the S.P of 20 books. Find his gain% or loss%?