A rectangular cross$-$section $(150$ mm $\backslash$times $300$ mm$)$ is subjected to a bending moment of $240$ kNm$.$ The bending occurs in the stiff direction. The materials stress$-$strain relationship is shown in the figure below. The material is anisotropic in such a way that Ed in tension is $1\mathrm{.}5$ times Et in compression. Find the maximum tensile and compressive stresses in the beam.