please help! what is the average real return and average nominal risk premium

thank you!

Problem 12-10 Calculating Real Returns and Risk Premiums [LO1] You've observed the following returns on Pine Computer's stock over the past five years: 15 percent, -6 percent, 18 percent, 14 percent, and 10 percent. Suppose the average inflation rate over this period was 1.7 percent and the average T-bill rate over the period was 5.2 percent. a. What was the average real return on the company's stock? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What was the average nominal risk premium on the company's stock? (Do not round intermediate calculations and enter your answer as a percent rounded to 1 decimal place, e.g., 32.1.)