Readings after yield

$\backslash$table$[[$Load $($kN$),$Extension $($in$),$Stress $($kN$/$mm$),$Strain$],[25\mathrm{.}7,\frac{1}{8},,],[28\mathrm{.}1,\frac{2}{8},,],[30,\frac{3}{8},,]]$ The cross sectional area $80\mathrm{.}595$mm$^2.$