The C.P of 10 pens is equal to the S.P of 12 pens. Find his gain % or loss%? Choose the most appropriate option.
A) 16 2/6%
B) 16 9/3%
C) 16 2/3%
D) 16 3/3%
E) 12 2/3%
10 16 2/3%P = 12 SP   12 --- 2 16 2/3%P loss   100 --- ? =&gt; 16 2/3%   Answer:16 2/3%
<result>C</result>
The C.P of 10 pens is equal to the S.P of 12 pens. Find his gain % or loss%?