Percy's Wholesale Supply has earnings before interest and taxes of $106,000. Both the book and the market value of debt is $170,000. The unlevered cost of equity is 15.5 percent while the pre-tax cost of debt is 8.6 percent. The tax rate is 38 percent. What is the firm's weighted average cost of capita?

I believe the answer to be 13.45% however if you could break down the steps and denote the meaning of what i'm solving at each step that would be very appreciated!