An investment advisor has recommended a $$50,000$ portfolio containing assets $R,J,$ and $K$;$$25,000$ will be invested in asset $R,$ with an expected annual return of $12$ percent; $$10,000$ will be invested in asset J$,$ with an expected annual return of $18$ percent; and $$15,000$ will be invested in asset $K,$ with an expected annual return of $8$ percent. The expected annual return of this portfolio is

A$.12\mathrm{.}00\%$

B$.10\mathrm{.}00\%$

C$.11\mathrm{.}78\%$

D$.12\mathrm{.}67\%$N