The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, then the value of x is:

Answer: Option B

Let C.P. of each article be Re. 1 C.P. of x articles = Rs. x
S.P. of x articles = Rs. 20
Profit = Rs. (20 - x)
$$\begin{array}{rl}& \therefore \frac{20-x}{x}\times 100=25\\ & \Rightarrow 2000-100x=25x\\ & 125x=2000\\ & \Rightarrow x=16\end{array}$$