The C.P of 15 books is equal to the S.P of 20 books. Find his gain% or loss%?  Select:
A) 25% loss	B) 16 2/8% loss	C) 16 3/3% loss	D) 36 2/3% loss	E) 56 2/3% loss
15 CP = 20 SP   20 --- 5 CP loss   100 --- ? =&gt; 25% loss   25% lossnswer:25% loss
<result>A</result>
The C.P of 15 books is equal to the S.P of 20 books. Find his gain% or loss%?