You manage the following $5 million portfolio that contains stocks A through D. The required rate of return on the market is 7.00% and the risk-free rate is 2.25%. What is the portfolio's required rate of return? Do not round your intermediate calculations. Amount Beta Stock A 725,000 1.15 275,000 0.50 B 3,500,000 1.25 500,000 0.80 D $5,000,000 a. 8.90% b. 7.44% c. 8.49% d. 7.71% e. 8.02%