The simple interest on Rs. 7,300 at 15% p.a. from 28^th April to 4^th November, approximately is

$$\eqalign{ & P = 7300 \cr & R = 15\% {\text{ per annum}} \cr & = \frac{{15}}{{365}}{\text{ per day}} \cr & t = {\text{2}}{{\text{8}}^{{\text{th}}}}{\text{ April to }}{{\text{4}}^{{\text{th}}}}{\text{ November}} \cr & t = 190{\text{ days}} \cr & {\text{SI}} = \frac{{PRT}}{{100}} \cr & = \frac{{7300}}{{100}} \times \frac{{15}}{{365}} \times 190 \cr & = 570{\text{ Answer}} \cr} $$