By selling 99 pens, a trader gains the cost of 33 pens. Find his gain percentage?  Choose the correct choice from the following options:	A) 33 1/3%	B) 33 7/3%	C) 33 1/8%	D) 32 1/3%	E) 33 1/5%
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 1/3%nswer: 33 1/3%
<result>A</result>
By selling 99 pens, a trader gains the cost of 33 pens. Find his gain percentage?