What is the expected return and standard deviation of a portfolio consisting of $$5400$ invested in a risk$-$free asset with an $7\mathrm{.}3-$percent

rate of return, and $$1800$ invested in a risky security with a $19\mathrm{.}3-$percent rate of return and a $24\mathrm{.}3-$percent standard deviation?

$16\mathrm{.}30$ percent, $18\mathrm{.}225$ percent

$10\mathrm{.}30$ percent, $6\mathrm{.}075$ percent

$6\mathrm{.}075$ percent, $10\mathrm{.}30$ percent