If the selling price of 60 articles is equal to the cost price of 30 articles, then the loss or gain percent is:
Choose one:
A) 55%
B) 35%
C) 66%
D) 45%
E) 50%
Let C.P. of each article be Re. 1.   Then, C.P. of 60 articles = Rs. 60;   S.P. of 60 articles = Rs. 30.   Loss % = 30/60 * 100= 
<gadget id="calculator">30/60 * 100</gadget>
<output>50</output>
50%   ANSW50%R:50%
<result>E</result>
If the selling price of 60 articles is equal to the cost price of 30 articles, then the loss or gain percent is: