You were hired as a consultant to Giambono Company, whose target

capital structure is $40\%$ debt, $15\%$ preferred, and $45\%$ common

equity.$$ The after$-$tax cost of debt is $6\mathrm{.}00\%,$ the cost of

preferred is $7\mathrm{.}50\%,$ and the cost of retained earnings is

$13\mathrm{.}00\%.$ The firm will not be issuing any new stock.$$

What is its WACC?$9\mathrm{.}38\%11\mathrm{.}44\%9\mathrm{.}19\%7\mathrm{.}22\%10\mathrm{.}22\%$