A one$-$year and two$-$year bonds currently pays $4\mathrm{.}2\%$ and $2\mathrm{.}8\%,$ respectively. What is the expected interest rate on a one$-$year bond next year according to the expectations theory?

$3\mathrm{.}5\%$

$2\mathrm{.}0\%$

$0\mathrm{.}9\%$

$1\mathrm{.}4\%$