Please give me specific steps, thanks!

7. (10%) You have the following data. Fill in the missing values of the table. a) (8%) Fill in the missing values in the table. b) (2%) Suppose you believe that the CAPM is the right model for the expected return. Is the expected return of firm A correct in the table? Suppose you purchased stock A expecting expected return of 10%. Suppose also that all the future forecasts remain the same. Based on the correct expected return calculated from the CAPM, you will buy more of stock A or sell it? Explain