Tom's Tool Factory is an investment center and is responsible for all of its net income and the use of its assets. This year, the invested assets totaled $$475,000,$ and net income was $$275,000.$ The return on investment $($ROI$)($rounded to one decimal place$)$ is

a$.57\mathrm{.}9\%$

b$.172\mathrm{.}3\%$

c$.115\mathrm{.}0\%$

d$.5\mathrm{.}0\%$