Suppose Fastest? Company's current balance sheet showed book value weights of 33 percent? debt, 11 percent preferred? shares, and 56 percent common equity. Assuming its cost of debt was 2.6 ?percent, the cost of preferred shares was 4.6 ?percent, and the cost of common equity was 9 ?percent, estimate Fastest? Company's WACC? (based on these book value? weights). The WACC is nothing ?%. ?(Round to two decimal? places.)