A short $220150-mm$ column supports the three axial loads as shown in the figure below. Given:

$a=220mm$

$b=150mm$

$h=200mm$

$P_1=60KN$

$P_2=75KN$

$P_3=25KN$

Modulus of elasticity $=45$GPa

Shear Modulus $=8$GPa

Assuming that the section remains plane, Answer the following:

The stress at point $"$A$"=$ MPa $[$with appropriate sign$]$

The stress at point $"$B$"=$ MPa $[$with appropriate sign$]$

The stress at point $"C"=$ MPa $[$with appropriate sign$]$