Suppose we observe the 3 year Treasury security rate (4R) to be 8 percent, the expected 1-year rate next year-Fr)-to be 4 percent, and the expected one-year rate the following year-ru-to be 6 percent. If the unbiased expectations theory of the term structure of interest rates holds, what is the 1-year Treasury security rate. 1R? (Round your answer to 2 decimal places.) Treasury security rate