Olsen Outfitters Inc. believes that its optimal capital structure consists of $55\%$ common equity and $45\%$ debt, and its tax rate is $25\%.$ Olsen must raise additional capital to fund its upcoming expansion. The firm will have $$1$ million of retained earnings with a cost of $r_s=13\%.$ New common stock in an amount up to $$7$ million would have a cost of $r_e=14\mathrm{.}5\%.$ Furthermore, Olsen can raise up to $$3$ million of debt at an interest $r_1$ ate $r_d=10\%$ and an additional $$3$ million of debt at $r_d=12\%.$ The CFO estimates that a proposed expansion would require an investment of $$5\mathrm{.}0$ million. What is the WACC for the last dollar raised to complete the expansion? Round your answer to two decimal places.