Assume these are the stock market and Treasury bill returns for a 5-year period: T-Bill Return Year Stock Market Return (%) (%) 2016 34.30 0.15 2017 14.00 0.15 2018 -3.90 0.15 2019 15.10 0.10 2020 24.50 0.12 Required: a. What was the risk premium on common stock in each year? b. What was the average risk premium? c. What was the standard deviation of the risk premium? (Ignore that the estimation is from a sample of data.) Complete this question by entering your answers in the tabs below. Required A Required B Required C What was the average risk premium? Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. Average risk premium %