The C.P of 16 books is equal to the S.P of 18 books. Find his gain% or loss%?  Choose the correct choice from the following answers:
A) 11 1/9%
B) 16 2/8%
C) 16 2/5%
D) 16 2/1%
E) 16 1/3%
16 CP = 18 SP   18 --- 2 CP loss   100 --- ? =&gt; 11 1/9% loss.11 1/9%nswer: 11 1/9%
<result>A</result>
The C.P of 16 books is equal to the S.P of 18 books. Find his gain% or loss%?