The C.P of 10 pens is equal to the S.P of 5 pens. Find his gain % or loss%?
Answers.
A) 50%  B) 40%  C) 30%  D) 60%  E) 20%
10 CP = 5 SP   10 --- 5 CP gain   100 --- ? =&gt; 50%(gain)   50%nswer: 50%
<result>A</result>
The C.P of 10 pens is equal to the S.P of 5 pens. Find his gain % or loss%?