An ad has generated $$600$ additional profit for Alison's small business. Running the ad on Facebook costs her $$500.$ What is the ROI of the ad$?$

$83\mathrm{.}3\%$

$20\mathrm{.}0\%$

$120\mathrm{.}0\%$

$16\mathrm{.}7\%$

$80\mathrm{.}0\%$

$100\mathrm{.}0\%$