Targaryen Corporation has a target capital structure $of65$ percent common stock, $5$ percent preferred stock, and $30$ percent debt. Its cost $of$ equity $is13$ percent, the cost $of$ preferred stock $is5$ percent, and the pretax cost $of$ debt $is6$ percent. The relevant tax rate $is25$ percent.

$a.$

What $is$ the company$s$ WACC?