Suppose that Model Nails, Incorporated's copital structure features 60 percent equity, 40 percent debt, and that its before-tax cost of debt is 6 percent, whlle its cost of equity is 10 percent. If the appropriate weighted average tax rate is 21 percent, what will be Model Nails' WACC? Multiple Choice 7.90 percent 6.84 percent 8.40 purcent