4. If the current one-year rate (one-year spot rate) and the expected one-year T-bill rates over the following three years (i.e., years 2, 3, and 4, respectively are as shown below, using the unbiased expectation theory, calculate the current (long-term) rates for one-, two-, three-, and four-year-maturity Treasury securities. 1R1 = 1%, E(2r1) = 3.75%, E(3r1) = 4.25% E(4r1) = 5.75%