answer 18, 19, and 20 please

Question 18 (1 point) Return of stock A 9% 4% 10% 15% 6% Year What is the variance of returns for stock A? (Enter your answer as a decimal rounded to 5 decimal places, not a percentage. For example, enter 0.00153 instead of 0.153%) Your Answer: Answer Question 19 (1 point) Suppose you earned nominal return of 9 percent on your investment last year. If the inflation rate last year was 2.7 percent, what was your real rate of return on this investment? (Enter your answers as a decimal rounded to 4 decimal places, not a percentage For example, enter 0.0843 instead of 8.43%) Your Answer Question 20 (1 point) A firm has a beta of 1.3. Calculate its equity cost of capital assuming that the expected return on the market is 10% and the risk-free rate is 2%. [Note: Enter your answer as a decimal rounded to four decimal places.] Your