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Question 15 Suppose that the current one-year rate and expected one-year T-bill rates over the following three years (i.e., years 2, 3, and 4, respectively) are as follows: IRI = 1.7%, E(2r1) =3.83%, E(3r1) = 5.7%, E(4r1) = 7.35% Using the unbiased expectations theory, calculate the current (long-term) rates for four-year-maturity Treasury securities (Write your answer in percentage and round it to 2 decimal places)