Delta Corporation has the following capital structure:

Cost (aftertax),Weights, Weighted Cost

Debt (K_d)7.5%,15%,1.13%

Preferred stock (K_p)6.2,10,0.62

Common equity (K_e) (retained earnings)8.5,75,6.38

Weighted average cost of capital (K_a)8.12%

a.If the firm has $48 million in retained earnings, at what size capital structure will the firm run out of retained earnings?(Enter your answer in millions of dollars (e.g., $10 million should be entered as "10").)