The C.P of 10 pens is equal to the S.P of 20 pens. Find his gain % or loss%?
Answers:
A) loss 16 2/8%
B) loss 50%
C) loss 16 2/3%
D) loss 18 2/3%
E) loss 16 25%
10 CP = 20 SP   20 --- 10 CP loss   100 --- ? =&gt; 50% loss   Answer:loss 50%
<result>B</result>
The C.P of 10 pens is equal to the S.P of 20 pens. Find his gain % or loss%?