The C.P of 15 books is equal to the S.P of 18 books. Find his gain% or loss%?	Choose the correct choice
A) 16 2/3%
B) 16 2/8%
C) 16 7/3%
D) 16 5/3%
E) 16 6/3%
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%?