A company has determined that its optimal capital structure consists of $40$ percent debt and $60$ percent equity. Given the following information, calculate the firm's weighted average cost of capital. Cost of Debt $=6\mathrm{.}9\%,$ Tax rate $=40\%,$ Current Stock Price $=$ $$23\mathrm{.}81,$ Long Run Growth rate $=2\mathrm{.}4\%,$ Next Year's Dividend $=$ $$2\mathrm{.}63.$ Show your answer to the nearest $\mathrm{.}1\%.$ Do not use the $\%$ sign in your answer. Enter your answer as a whole number, thus $9\mathrm{.}2\%$ would be $9\mathrm{.}2$ rather than $\mathrm{.}092$ or $9\mathrm{.}2\%.$