Treasury bills are currently paying 9 percent and the inflation rate is 3.1 percent. a. What is the approximate real rate of interest? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What is the exact real rate? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)