The expected average rate of return for a proposed investment of $$569,200$ in a fixed asset with a useful life of $4$ years, straight$-$line depreciation, no residual value, and an expected total income of $$193,240$ for the $4$ years is $($round to two decimal places$)$

$$ a$.16\mathrm{.}97\%$

b$.0\mathrm{.}34\%$

$$ c$.0\mathrm{.}68\%$

$$ d$.8\mathrm{.}49\%$