The C.P of 17 books is equal to the S.P of 20 books. Find his gain% or loss%?	Pick:	A) 16 2/3% loss	B) 16 2/8% loss	C) 16 3/3% loss	D) 36 2/3% loss	E) 15% loss
17 CP = 20 SP   20 --- 3 CP loss   100 --- ? =&gt; 15% loss   Answer:15% loss
<result>E</result>
The C.P of 17 books is equal to the S.P of 20 books. Find his gain% or loss%?