A portfolio is invested $20$ percent in Stock G$,55$ percent in Stock J$,$ and $25$ percent in Stock K$.$ The expected returns on these stocks are $9$ percent, $20$ percent, and $28$ percent, respectively. What is the portfolio's expected return?

Multiple Choice

$15\mathrm{.}20\%$

$20\mathrm{.}59\%$

$20\mathrm{.}79\%$

$18\mathrm{.}81\%$

$19\mathrm{.}80\%$