ABC Company has a contribution margin of $40\%.$ Sales are $$312,500,$ net operating income is $$25,000,$ and average operating assets are $$200,000.$ What is the company's return on investment $($ROI$)?$

Additional Help: ROI $=$ Net operating income $-$: Average operating assets

Group of answer choices

$12\mathrm{.}5\%$

$62\mathrm{.}5\%$

$64\mathrm{.}0\%$

$8\mathrm{.}0\%$