急！请求帮助 关于capm

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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

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关键词：CAPM 请求帮助 cap APM 求帮助 investment positive expected required percent

a，R=4+8beta
b，8
c，4+8*1.5=16
d，4+8*0.8=10.4>9.8  NPV为负
e，beta=0.9

谢谢。呵呵