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% loss B) 16 2/7% loss C) 16 8/3% loss D) 96 2/3% loss E) 16 4/3% loss
15 CP = 18 SP   18 --- 3 CP loss   100 --- ? =&gt; 16 2/3% loss   16 2/3% lossnswer:16 2/3% loss
<result>A</result>
The C.P of 15 books is equal to the S.P of 18 books. Find his gain% or loss%?