If the cost price of 50 articles is equal to the selling price of 25 articles, then the gain or loss percent is? Choose the correct choice from the following answers
A) 16
B) 127
C) 12
D) 18
E) 100
Percentage of profit = 25/25 * 100= 
<gadget id="calculator">25/25 * 100</gadget>
<output>100</output>
100%   Answer: 100
<result>E</result>
If the cost price of 50 articles is equal to the selling price of 25 articles, then the gain or loss percent is?