The C.P of 10 pens is equal to the S.P of 12 pens. Find his gain % or loss%? Choose the correct option.
A) 66 3/3%
B) 16 2/3%
C) 16 4/3%
D) 76 2/3%
E) 66 2/3%
Explanation:   10 16 4/3%P = 12 SP   12 --- 2 16 4/3%P loss   100 --- ? =&gt; 16 2/3%   Answer: 16 4/3%
<result>C</result>
The C.P of 10 pens is equal to the S.P of 12 pens. Find his gain % or loss%?