The current one$-$year Treasury bill rate is $0\mathrm{.}40$ percent and the expected one$-$year rate $12$ months from now is $1\mathrm{.}28$ percent. According to the unbiased expectations theory, what should be the current rate for a two$-$year Treasury security? $($Do not round intermediate calculations. Round your percentage answer to $2$ decimal places. $($e$.$g$.,32\mathrm{.}16))$

$\%$