5.1 - The Treasury bill rate is 4 percent, and the expected return on the market portfolio is 12 percent. Using the CAPM:

• Draw a graph showing how the expected return varies with beta.
• What is the risk premium on the market?
• What is the required return on an investment with a beta of 1.5?
• If an investment with a beta of 0.8 offers an expected return of 9.8 percent, does it have a positive NPV?
• If the market expects a return of 11.2 percent of stock X, what is its beta?

那位高手能够解一下这道题啊？不胜感激