If the selling price of 50 articles is equal to the cost price of 40 articles, then the loss or gain percent is:
Choose one.
A) 20% loss
B) 20% gain
C) 25% loss
D) 25% gain
E) 35% gain
Let C.P. of each article be Re. 1.   Then, C.P. of 50 articles = Rs. 50;   S.P. of 50 articles = Rs. 40.   Loss % = 10/50 * 100= 
<gadget id="calculator">10/50 * 100</gadget>
<output>20</output>
20%   20% lossNSWER:20% loss
<result>A</result>
If the selling price of 50 articles is equal to the cost price of 40 articles, then the loss or gain percent is: