Question 10 The monthly returns on US Treasury bills over the past 50 years have: exceeded inflation for all periods. provided consistently positive monthly rates of return for investors. Oranged between zero and five percent on an annualized basis. O always been positive on a real basis. sometimes been less than the monthly rate of inflation. Question 10 The monthly returns on US Treasury bills over the past 50 years have: exceeded inflation for all periods. provided consistently positive monthly rates of return for investors. Oranged between zero and five percent on an annualized basis. O always been positive on a real basis. sometimes been less than the monthly rate of inflation