Finance, and how do you reach to the answer.

Q: Of the $10,000 invested in a two-stock portfolio, 30 percent is invested in Stock A and 70 percent is invested in Stock B. If Stock A has a beta equal to 2.0 and the beta of the portfolio is 0.95, what is the beta of Stock B?

Q: Suppose that r_RF = 5% and r_M = 12%. What is the appropriate required rate of return for a stock that has a beta coefficient equal to 1.5?

Q: The current risk-free rate of return, r_RF, is 4 percent and the market risk premium, RP_m, is 5 percent. If the beta coefficient associated with a firm's stock is 2.0, what should be the stock's required rate of return?

Q: If the risk-free rate of return, r_RF, is 4 percent and the market return, r_M, is expected to be 12 percent, what is the required rate of return for a stock with a beta, B, equal to 2.5?