The cost of 20 articles is equal to selling price of 10. Find the gain or loss percent? Choose the correct choice from the following options
A) 50%	B) 100%	C) 25%	D) 15%	E) 60%
C.P. of each article be $1   C.P. of 10 articles = 10   gain% = 10/10*100= 
<gadget id="calculator">10/10*100</gadget>
<output>100</output>
100%   Answer is 100%
<result>B</result>
The cost of 20 articles is equal to selling price of 10. Find the gain or loss percent?