Please give a step by step break down of how you find the weighted average cost of capital. Really struggling with it.

Oisen Outfitters. Inc. belleves that its optimal capital structure consists of 60% comenon equity and 40% debt, and its tax rate is 25%. Oisen must raise additional capital to fund its upcoming expansion. The firm will have 33 milion of retained earnings with a cost of r s =11 s. New common stock in an amount up to 39 milion would have a cost of re =13.5%. Furthermore, Olsen can ralse up to 14 milion of debt at an interest rate of rd =11% and an additional 53 milion of debt at rdd=15%. The CFO estimates that a proposed expansion would require an imvestment of $5.2 million. What is the WACC far the last doliar raised to complete the expansion? Round your answer to two decimal places