The cost price of a particular amount of articles is same as the number of articles. Selling price of the articles comes out to be 20. Over the whole transaction 25% is gained. What is X?
Options:  A) 16  B) 77  C) 15  D) 18  E) 161
Explanation:   According to the question let n be the number of articles.   =&gt; Cost price of n articles = n   =&gt; Selling price of n articles = 20   =&gt; Profit % = 25%   =&gt; Profit % = (SP - CP)/CP X 100   Putting the values in the formula   (20-n)/n x 100 = 25   =&gt; 5n/4 = 20   =&gt; n = 16   16NSWER: 16
<result>A</result>
The cost price of a particular amount of articles is same as the number of articles. Selling price of the articles comes out to be 20. Over the whole transaction 25% is gained. What is X?