Suppose we observe the three$-$year Treasury security rate $($R$31)($R$31)$ to be $4\mathrm{.}6$ percent, the expected one$-$year rate next year$$ E$($r$12)$Er$12$to be $5\mathrm{.}2$ percent, and the expected one$-$year rate the following year$$ E$($r$13)$E$($r$13)$to be $6\mathrm{.}2$ percent. If the unbiased expectations theory of the term structure of interest rates holds, what is the one$-$year Treasury security rate?

Note: Do not round intermediate calculations. Round your percentage answer to $2$ decimal places