(Solved): Calculate the second moment of area of the section below about the axis XX through the centroid ...

Calculate the second moment of area of the section below about the axis $$\mathrm{X}?\mathrm{X}$$ through the centroid. If it is subjected to a bending moment $$\mathrm{M}\mathrm{KN}?\mathrm{m}$$ acting at $$\mathrm{X}?\mathrm{X}$$. Calculate the maximum allowable value of $$\mathrm{M}$$, given that the tensile and compressive stresses are limited to $$30\mathrm{MPa}$$ and 45 MPa respectively. (25 marks)