please explain the answer clearly,

BL Company has a capital structure of IDR 1 million and will try to maintain this book value. At this time "L" earns Rp. 250,000 per year before tax. 50% tax rate. The company has capital consisting of a total share capital of 100.00 shares and pays all profits as dividends. The company is considering issuing bonds to replace some of its common stock. The cost of debt and stock prices at various levels of debt are shown in the following table Debt Average Cost of Debt Stock Price Rp. 0 Rp. 10,00 Rp. 100.000 Rp. 10,50 Rp. 200.000 Rp. 10,80 Rp. 300.000 6,5% Rp. 11,00 Rp. 400.000 Rp. 11,15 Rp. 500.000 8% Rp. 10,50 6% 6% 7% a) By observing the table above, what is the optimal capital structure based on the stock price approach? By looking at the table above, it can be seen that the share price is highest when the amount of debt is Rp. 400,000, then the optimal capital structure is when the total debt is Rp. 400,000 with shares of Rp. 600,000. b) With the overall capitalization approach, with these data, calculate (by filling in the following table) which shows Ko (weighted average of the cost of debt after tax and cost of own capital, can be calculated by (profit before tax * (1-t)))/ value company), Ke (proportion of profit after tax to share value), Kd (average cost of debt) Debt 0 100.000 200.000 300.000 400.000 500.000 Earnings Before Interest and Taxes Interest Earnings Before Taxes Taxes (50%) Earning After Taxes Number of Shares Earnings Per Share Stock Price Ke (in %) Share Value The Value of Company Ko (in %) c) What is your opinion on answer A, does it match the calculations in answer B? The calculation shows that ko is the lowest when the debt is Rp. 300,000, so the optimal capital structure with the stock price approach is different from the overall capitalization approach