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Suppose that the current one-year rate (spot) and expected one-year T-bill rates over the following three years (i.e., years 2,3, and 4, respectively) are as follows:_1R_1 = 4%, E[2r_1) = 3.5%, E[3r_1] = 3.25%, E[4r_1) = 3.15%,Using the unbiased expectation theory, calculate the current (long-term) rate for one-, two-, three- and four- year maturity Treasury securities. Plot the resulting yield curve