A firm just paid a dividend of $$3\mathrm{.}50,$ sells for $$24\mathrm{.}00$ per share, and has a growth rate of $6\mathrm{.}5$ percent. Which of the following is the cost of equity using the discounted cash flow $($DCF$)$ approach?

$15\mathrm{.}53\%$

$21\mathrm{.}08\%$

$22\mathrm{.}03\%$