$0/1$ point PLZ HELP:

A rectangular bar of dimensions $b$hmm is subjected to a combined bending load as shown.

For $b=12mm,h=25mm,$ and $My=132Nm,Mz=63Nm,$

determine the bending stress at point A$.$ PLEASE PLEASE Can you ALSO show how you would determine the bending stress at Point B & for Point C & Point D too. Will rate!! $[$Mpa$]($sign sensitive: positive for tensile stress, negative for compressive stress$)$

$270\mathrm{.}4$