Solve this problem $($stress analysis$)$

The curved beam is subjected to a bending moment of as shown. Determine the maximum compressive and tensile stresses in the section. Take M $=900$ N$.$m$,$ ri $=400$ mm$,$ a $=100$ mm$,$ b $=100$ mm$,$ c $=15$ mm$,$ and d $=20$ mm$.$