Over the Past 35 Years, the Prevailing Market Yield or Discount

Short Answer

Over the past 35 years, the prevailing market yield or discount rate on 90-day T-bills has ranged from a low of 0.20% in May, 2009 to a high of 20.82% in August of 1981. (The period from 1979 to 1990 was a time of historically high inflation rates and interest rates.) How much more would you have paid for a $100,000 face value 90-day T-bill at the May 2009 discount rate than at the August 1981 discount rate?