Stock A has a beta of 1.5. The S&P 500 has a return of 12%. The return on T-bills is currently 4%.

1. What is the required return on stock A using CAPM?
2. What is the expected return on a portfolio that is equally invested in the S&P500 and t-bills?
3. If you construct an equally weighted portfolio of the 3 assets above (stock A, S&P 500 and t-bill), what is the portfolio beta?

Please show the steps, thank you.