A firm will use $$400,000$ of debt, $$125,000$ of preferred equity, and $$475,000$ of common equity to fund a $$1$ million asset expansion project. The cost of debt is $4\mathrm{.}1\%,$ the cost of preferred equity is $8\mathrm{.}9\%$ and the cost of common equity is $12\mathrm{.}28\%.$ Determine the firm's WACC.

$8\mathrm{.}5855\%$

$9\mathrm{.}4257\%$

$8\mathrm{.}4432\%$

$9\mathrm{.}0021\%$

none of these