If the cost price of 50 articles is equal to the selling price of 20 articles, then the gain or loss percent is?  Choose the most appropriate option:
A) 16 B) 127 C) 12 D) 18 E) 150
Percentage of profit = 30/20 * 100= 
<gadget id="calculator">30/20 * 100</gadget>
<output>150</output>
150%   Answer: 150
<result>E</result>
If the cost price of 50 articles is equal to the selling price of 20 articles, then the gain or loss percent is?