From 1991 to 2000, the U.S. economy had an annual inflation rate of around 2.93%. The historical

Question:

From 1991 to 2000, the U.S. economy had an annual inflation rate of around 2.93%. The historical annual nominal risk-free rate for this same period was around 5.02%. What is the real interest rate using the approximate nominal interest rate equation and the true nominal interest rate equation for that decade?