The C.P of 15 books is equal to the S.P of 18 books. Find his gain% or loss%? Choose the correct choice from the following answers:
A) 16 2/3%  B) 16 2/8%  C) 16 2/5%  D) 16 2/1%  E) 16 1/3%
15 CP = 18 SP   18 --- 3 CP loss   100 --- ? =&gt; 16 2/3% loss.16 2/3%nswer: 16 2/3%
<result>A</result>
The C.P of 15 books is equal to the S.P of 18 books. Find his gain% or loss%?