Final answer:
The requested analysis could not be completed due to insufficient information. In general terms, introducing debt affects a firm's net income, total dollar return to investors, and ROE due to changes in interest expenses and tax savings. Varying interest rates and not-for-profit status further influence these outcomes, illustrating the relationship between capital structure and risk.
Step-by-step explanation:
The question relates to the impact of changing the capital structure on a firm's net income, total dollar return to investors, and return on equity (ROE). Specifically, it looks at how replacing half of Seattle Health Plans' equity with debt impacts these financial metrics under different scenarios: a fixed interest rate, a higher interest rate, varying operating incomes, and the case of operating as a not-for-profit.
Unfortunately, the provided information does not contain the necessary figures to perform the analysis requested by the student. However, in a general sense, if the company were to replace half of its equity with debt bearing an 8% interest rate, it would pay interest on this debt, reducing its taxable income and therefore taxes paid, potentially increasing after-tax income and ROE. On the other hand, a higher interest rate of 15% would lead to higher interest expenses and lower net income and ROE.
For the scenario with varying EBIT, the financial outcomes would be calculated for each level of operating income, and then expected values could be determined based on the probabilities provided. If Seattle Health Plans were not-for-profit and exempt from paying taxes, the impact of changing the capital structure would be different since tax savings from debt interest would be non-existent.