The C.P of 16 books is equal to the S.P of 18 books. Find his gain% or loss%?	Choose one:
A) 16 2/3% loss  B) 11 1/9% loss  C) 16 3/3% loss  D) 36 2/3% loss  E) 56 2/3% loss
16 CP = 18 SP   18 --- 2 CP loss   100 --- ? =&gt; 11 1/9% loss   Answer:11 1/9% loss
<result>B</result>
The C.P of 16 books is equal to the S.P of 18 books. Find his gain% or loss%?