The C.P of 17 books is equal to the S.P of 18 books. Find his gain% or loss%?	Select:
A) 16 2/3%  B) 16 2/8%  C) 5 5/9%  D) 16 2/1%  E) 16 1/3%
17 5 5/9%P = 18 SP   18 --- 1 5 5/9%P loss   100 --- ? =&gt; 5 5/9% loss.Answer: 5 5/9%
<result>C</result>
The C.P of 17 books is equal to the S.P of 18 books. Find his gain% or loss%?