If a firm has a weighted$-$average cost of capital $($WACC$)$ of $9\mathrm{.}734\%,$ a required return on debt of $2\mathrm{.}119\%$ and a required return on equity of $15\mathrm{.}563\%,$ what proportion of the firm's capital structure is equity if the firm pays $22\%$ in taxes? Assume no preferred stock. Enter your answer as a decimal, e$.$g$.0\mathrm{.}3456$ for $34\mathrm{.}56\%,$ not $34\mathrm{.}56.$ using excel