A man purchased an article for Rs. 1500 and sold it at 25% above the cost price. If he has to pay Rs. 75 as tax on it his net profit percentage will be = ?

$$\eqalign{ & {\text{Cost price}} = {\text{Rs}}{\text{. 1500}} \cr & {\text{Profit after selling}} \cr & = 25\% {\text{ of }}1500 \cr & = {\text{Rs}}{\text{.375}} \cr & {\text{Net profit }} \cr & = {\text{Rs}}{\text{.375}} - {\text{Rs}}{\text{.75}} \cr & = {\text{Rs}}{\text{.300}} \cr & {\text{Net profit }}\% \cr & = \frac{{300}}{{1500}} \times 100 \cr & = 20\% \cr} $$