Suppose that the current one-year rate and expected one-year T-bill rates over the following three years (ie.. years 2, 3, and 4, respectively) are as follows: IRI-2.08%, E(201) 4,46%, E(381) -5.5%, E(41) - 7.79% 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)