The C.P of 15 pens is equal to the S.P of 18 pens. Find his gain% or loss%?
Pick:
A) 12 2/4%	B) 17 2/6%	C) 16 2/3%	D) 16 2/7%	E) 34 2/5%
16 2/3%   15 16 2/3%P = 18 SP   18 --- 3 16 2/3%P loss   100 --- ? =&gt; 16 2/3% loss
<result>C</result>
The C.P of 15 pens is equal to the S.P of 18 pens. Find his gain% or loss%?