Explain all the formula and calculation briefly

Use the following information to answer the questions. Security Beta Standard deviation Market 1.0 10% Risk-free 0.0 2% Firm A 1.5 30% Firm B 20% Firm C 2.0 25% 1) Figure out the expected return for Firm A. (30points) 2) Figure out the beta for Firm B (30points) 3) Compare Firm A with Firm C. 1) Expected retum 8.0% 4.0% ( )% 6.0% ()% + Which firm has higher total risk? Firm A or C? (20points) 11) Which firm has higher expected return? Firm A or C? (20points) 4) Among three kinds of risk: total risk, systematic risk, and unsystematic risk. Which risk remains even after forming a diversified portfolio? (20points) 5) Among three kinds of risk: total risk, systematic risk, and unsystematic risk, which risk affects the expected return on a stock? (20points)