A thin$-$walled $(1$ mm thickness$)$ equal$-$angle section ABC has flanges of width $60$mm as shown in figure below. It is subjected to loads of Mx$=20$kN$-$m and My$=10$kN$-$m$.$

$($a$)$ Determine the bending stress $\backslash$sigma zz at the points A$,$ B and C

$($b$)$ Determine the location $($position $/$ orientation$)$ of the Neutral Axis and show it on a sketch of the cross section.

$($c$)$ Determine the principal axes of the section and show these on a sketch of the cross section, clearly indicating the Imax and Imin axes.