Given the following term structure and assuming the unbiased expectation theory holds, answer the following question:

Term Structure of Treasury Securities:

Year Yield $\%$

$14\mathrm{.}6$

$24\mathrm{.}9$

$35\mathrm{.}2$

$45\mathrm{.}4$

$55\mathrm{.}8$

What is the $4-$year rate $1$ year from today?

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