$($Related to Checkpoint $14\mathrm{.}1)($Weighted average cost of capital$)$ The target capital structure for QM Industries is $39$ percent common stock, $12$ percent preferred stock, and $49$ percent debt. If the cost of common equity for the firm is $18\mathrm{.}9$ percent, the cost of preferred stock is $9\mathrm{.}9$ percent, the before$-$tax cost of debt is $7\mathrm{.}3$ percent, and the firm's tax rate is $35$ percent, what is QM$\text{'}$s weighted average cost of capital?