By selling 100 pencil, a trader gains the cost of 40 Pencil. Find his gain percentage?  Choose the correct choice from the following answers: A) 26 1/3% B) 51 1/3% C) 40% D) 53 1/3% E) 34 1/3%
C   40%   Let the CP of each pencil be Rs. 1.   CP of 100 pens = Rs. 100   Profit = Cost of 40 pencil = Rs. 40   Profit% = 40/100 * 100= 
<gadget id="calculator">40/100 * 100</gadget>
<output>40</output>
40%
<result>C</result>
By selling 100 pencil, a trader gains the cost of 40 Pencil. Find his gain percentage?