In March 2019, one-year U.S. government bond rates were about 2.4%, while the inflation rate that year

Question:

In March 2019, one-year U.S. government bond rates were about 2.4%, while the inflation rate that year was 1.5%. In March 2021, one-year interest rates were about 0.1%, and the inflation rate that year was about 8.5%. What real interest rate did investors earn from March 2019–2020 and from March 2021–2022?

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