Suppose we have the following Treasury bill returns and inflation rates over an eight year period: Year Treasury Bills Inflation 1 11.47% 14.07% 2 12.41 17.11 3 10.08 11.34 4 9.33 8.93 5 9.90 11.34 6 12.28 13.85 7 15.19 18.09 8 17.11 18.07 a. Calculate the average return for Treasury bills and the average annual inflation rate for this period. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Treasury bills 11.85 % Inflation 13.75 % b. Calculate the standard deviation of Treasury bill returns and inflation over this period. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Treasury bills % Inflation % c. What was the average real return for Treasury bills over this period? (Negative amount should be indicated by a minus sign. Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Average real return %