Klose Outfitters Inc. believes that its optimal capital structure having of 60% common equity and 40% debt, and its tax rate is 40%. Klose have raise additional capital to fund its upcoming expansion. The firm will has $2 million of new retained earnings with a cost of rs=11.77%. New common stock in an amount up to $6 million would have a cost of re=14.82%. Moeover, Klose can raise up to $3 million of debt at an interest rate of rd=10% and an additional $4 million of debt at rd=12%. The CFO estimates that a proposed expansion would needs an investment of $5.9 million. What is the WACC for the last dollar raised to done the expansion?