suppose that hanna nails, incorporated's capital structure features 45 percent equity, 55 percent debt, and that its before-tax cost of debt is 5 percent, while its cost of equity is 9 percent. if the appropriate weighted average tax rate is 21 percent, what will be hanna nails' wacc? multiple choice 5.18 percent 6.22 percent 6.72 percent 6.80 percent