You note the following yield curve in The Wall Street Journal. According to the unbiased expectations theory, what is the one$-$year forward rate for the period beginning two years from today, $3$f$1?$

Note: Do not round intermediate calculations. Round your percentage answer to $2$ decimal places $($e$.$g$.,32\mathrm{.}16).$

Maturity Yield

One day $3\mathrm{.}30\%$

One year $3\mathrm{.}90$

Two years $6\mathrm{.}80$

Three years $9\mathrm{.}70$