Final answer:
The firm's required rate of return is 65.9722%, the market risk premium is 4.644%, and the security risk premium is 61.9422%.
Step-by-step explanation:
To calculate the firm's required rate of return, we can use the Capital Asset Pricing Model (CAPM) formula:
Risk-free rate + (Beta * Market risk premium)
1. Firm's required rate of return = 4.03 + (8 * (8.674 - 4.03)) = 65.9722%
2. Market risk premium = 8.674 - 4.03 = 4.644%
3. Security risk premium = Firm's required rate of return - Risk-free rate = 65.9722% - 4.03% = 61.9422%