Keys Inc's stock has a required rate of return of $12\mathrm{.}24\%,$ and it sells for $$63$ per share. Keys' dividend is expected to grow at a constant rate of $7\mathrm{.}09\%$ per year. What was Keys' last dividend, D$0?$

$1.$

$$1\mathrm{.}12$

$2.$

$$1\mathrm{.}36$

$3.$

$$3\mathrm{.}03$

$4.$

$$3\mathrm{.}24$

$5.$

$$1\mathrm{.}24$