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

$$\eqalign{ & {\text{Let the S}}{\text{.P}}{\text{. be Rs}}{\text{. }}x. \cr & {\text{Profit}} = 25\% \cr & {\text{Then,}} \cr & {\text{C}}{\text{.P}}{\text{.}} = x - 25\% {\text{ of Rs}}{\text{. }}x \cr & = 75\% {\text{ of Rs}}{\text{. }}x \cr & = {\text{Rs}}{\text{.}}\left( {\frac{3}{4}x} \right) \cr & {\text{Profit}} = {\text{Rs}}.\left( {x - \frac{3}{4}x} \right) \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\text{Rs}}.\frac{x}{4} \cr & \therefore {\text{Profit }}\% \cr & = \left( {\frac{x}{4} \times \frac{4}{{3x}} \times 100} \right)\% \cr & = 33\frac{1}{3}\% \cr} $$