please show work for all steps

Problem 7-24 Portfolio risk and return Ebenezer Scrooge has invested 50% of his money in share A and the remainder in share B. He assesses their prospects as follows: a. What are the expected return and standard deviation of returns on his portfolio? Note: Do not round intermediate calculations. Enter your answers as o percent rounded to 2 decimal places. b. How would your answer change if the correlation coefficient were 0 or -0.60 ? Note: Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places. c. Is Mr. Scrooge's portfolio better or worse than one invested entirely in share A, or is it not possible to say