Delta Corporation has the following capital structure:

Cost $($aftertax$)$ Weights Weighted Cost

Debt $($Kd$)6\mathrm{.}5\%10\%\mathrm{.}65\%$

Preferred stock $($Kp$)5\mathrm{.}2251\mathrm{.}30$

Common equity $($Ke$)($retained earnings$)9\mathrm{.}5656\mathrm{.}18$

Weighted average cost of capital $($Ka$)8\mathrm{.}13\%$

If the firm has $$39$ million in retained earnings, at what size capital structure will the firm run out of retained earnings?