By selling an article, a man makes a profit of 25% of its selling price. His profit percent is = ?

Answer: Option D

According to the question,
25% of selling price
$$=\frac{1\to \text{Profit}}{4\to \text{Selling price}}$$
Cost price = Selling price - Profit
Cost price = 4 - 1
Cost price = 3
$$\begin{array}{rl}& \text{Profit }\%\\ & =\frac{\text{Profit}}{\text{Cost price}}\times 100\\ & =\frac{1}{3}\times 100\\ & =33\frac{1}{3}\%\end{array}$$