The U$.$S$.$ Treasury borrowed money for $10$ years, selling each I O U for $\backslash (\backslash$$ $777\mathrm{.}40\backslash ).$ What is the interest rate? $\backslash (1\mathrm{.}025\backslash \%\backslash )\backslash (2550\backslash \%\backslash )\backslash (1\mathrm{.}035\backslash \%\backslash )\backslash (3\mathrm{.}550\backslash \%\backslash )$