Please show how to work it (without using excel)! Thank you in advance!

(Note: There are 3 parts)

Year 3. Here are inflation rates and U.S. stock market and Treasury bill returns between 1929 and 1931: Inflation% Stock market return% T-Bill return% 1929 -0.2 -145 1930 -6.0 -43.9 1931 0.6 57.3 1.1 a. What was the real return on the stock market in each year? b. What was the average real return? c. What was the risk premium in each year