By selling 90 pens, a trader gains the cost of 30 pens. Find his gain percentage?	Choose the most appropriate option
A) 33.3%  B) 32.3%  C) 31.3%  D) 30.3%  E) 29.3%
Let the CP of each pen be Rs. 1.   CP of 90 pens = Rs. 90   Profit = Cost of 30 pens = Rs. 30   Profit% = 30/90 * 100 = 33.3%   33.3%nswer:33.3%
<result>A</result>
By selling 90 pens, a trader gains the cost of 30 pens. Find his gain percentage?