The C.P of 10 pens is equal to the S.P of 12 pens. Find his gain % or loss%?	Choose one:
A) 16 2/3% profit
B) 50/6% profit
C) 16 2/3% loss
D) 100/3% loss
E) 120/3% loss
Explanation:   10 16 2/3% lossP = 12 SP   12 --- 2 16 2/3% lossP loss   100 --- ? =&gt; 16 2/3%   ANSWER IS 16 2/3% loss
<result>C</result>
The C.P of 10 pens is equal to the S.P of 12 pens. Find his gain % or loss%?