By selling 100 pens, a trader gains the cost of 40 pens. Find his gain percentage? Answers.
A) 40% B) 50% C) 60% D) 70% E) 30%
Let the CP of each pen be Rs. 1.   CP of 100 pens = Rs. 100   Profit = Cost of 40 pens   = Rs. 40   Profit% = 40/100* 100= 
<gadget id="calculator">40/100* 100</gadget>
<output>40</output>
40%   40%nswer: 40%
<result>A</result>
By selling 100 pens, a trader gains the cost of 40 pens. Find his gain percentage?