By selling 99 pens, a trader gains the cost of 33 pens. Find his gain percentage?
Choose the correct choice:
A) 33 1/3
B) 33 1/5
C) 33 1/9
D) 33 1/4
E) 33 1/1
Let the CP of each pen be Rs. 1.   CP of 99 pens = Rs. 99   Profit = Cost of 33 pens = Rs. 33   Profit% = 33/99 * 100 = 33 1/3%.33 1/3nswer: 33 1/3
<result>A</result>
By selling 99 pens, a trader gains the cost of 33 pens. Find his gain percentage?