If the selling price of 80 articles is equal to the cost price of 40 articles, then the loss or gain percent is:  Choose the correct choice from the following options:
A) 30%	B) 35%	C) 50%	D) 55%	E) 40%
Let C.P. of each article be Re. 1.   Then, C.P. of 80 articles = Rs. 80;   S.P. of 80 articles = Rs. 40.   Loss % = 40/80 * 100= 
<gadget id="calculator">40/80 * 100</gadget>
<output>50</output>
50%   ANSWER:50%
<result>C</result>
If the selling price of 80 articles is equal to the cost price of 40 articles, then the loss or gain percent is: