If the cost price of 50 articles is equal to the selling price of 30 articles, then the gain or loss percent is?	Choices:  A) 22  B) 65  C) 78  D) 66.67  E) 25
Given that, cost price of 50 article is equal to selling price of 30 articles.   Let cost price of one article = Rs. 1   Selling price of 30 articles = Rs. 50   But Cost price of 30 articles = Rs. 30   Therefore, the trader made profit.\Percentage of profit = 20/30 * 100 = 66.67%   Answer:66.67
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If the cost price of 50 articles is equal to the selling price of 30 articles, then the gain or loss percent is?