Oriole has a capital structure, based on current market values, that consists of percent debt, $4$ percent preferred stockand $46$ percent common stockIf the returns required by investors are $10$ percent, $13$ percent, and $15$ percent for the debt, preferred stock and common stockrespectively, what is Oriole's after$-$tax WACC? Assume that the firm's marginal tax rate is $28$ percent. $($Do not round Intermediate calculations Round answer to $1$ decimal place, e$.$g$.15\mathrm{.}2\%.)$