What was the average real return on the company's stock?

What was the average nominal risk premium on the company's stock?

You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 2 percent, -10 percent, 26 percent, 15 percent, and 13 percent. The average inflation rate over this period was 3.5 percent and the average T-bill rate was 3.75 percent