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Delta Corporation has the following capital structure: Cost(aftertax) Weights Weighted Cost Debt (Kd) 6.1 % 30 % 1.83 %Preferred stock (Kp) 7.6 20 1.52 Common equity (Ke) (retainedearnings) 13.1 50 6.55 Weighted average cost of capital (Ka) 9.90 %a. If the firm has $23 million in retained earnings, at what sizecapital structure will the firm run out of retained earnings?(Enter your answer in millions of dollars (e.g., $10 million shouldbe entered as "10").) b. The 6.1 percent cost of debt referred toearlier applies only to the first $6 million of debt. After thatthe cost of debt will go up. At what size capital structure willthere be a change in the cost of debt? (Enter your answer inmillions of dollars (e.g., $10 million should be entered as"10").)