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?
Choose the correct choice from the following answers.
A) 15  B) 18  C) 16  D) 20  E) None of these
Explanation:   According to the question let n be the number of articles.   =&gt; 16ost price of n articles = n   =&gt; Selling price of n articles = 20   =&gt; Profit % = 25%   =&gt; Profit % = (SP - 16P)/16P X 100   Putting the values in the formula   (20-n)/n x 100 = 25   =&gt; 5n/4 = 20   =&gt; n = 16   ANSWER 16
<result>C</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?