Need help with the following problem. Please show work.

3. (6 points) Suppose that TipsNToes, Inc.'s capital structure features 60 percent equity, 40 percent debt, and its cost of equity is 10 percent, while its before-tax cost of debt is 9 percent. If the appropriate weighted average tax rate is 25 percent, what will be TipsNToes's after-tax WACC