You are a portfolio manager and know the following information:

- The current risk-free rate is 1.65%

- The market's required rate of return is 8.40%

- The required return on AMD is 16.35%

- The required return on DAL is 11.90%

- The market is in equilibrium

(a) Calculate the beta for AMD and DAL.

(b) Now you are creating portfolio including AMD, DAL, and the market. If you invest 45% of your portfolio in AMD, 25% in DAL, and the remaining 30% in the market, what is your portfolio's beta?