Tommy constructs a complete portfolio from Treasury bills that pay $4\%$ and a risky portfolio $AH.$ AH is

composed of two risky securities$,40\%$ from Amy and $60\%$ from Hyunhu. Amy has an expected rate of return of

$16\%,$ and Hyunhu has an expected rate of return of $12\%.$ Tommy's complete portfolio has an expected return of

$10\%.$ In his complete portfolio, how much $($in $\%)$ is invested in Hyunhu?

$\mathrm{.}3750$

$13\mathrm{.}6\%$

$12\%$

$\mathrm{.}6250$