Problem $2$: $40$ point

For the beam section given: Concrete is $C25$ and longitudinal reinforcement is S$420$ steel and total tension steel area A s $=2200m{m}^2$ and compressive steel area is $A{s}^{\text{'}}=500m{m}^2.$ Using TS$500$ material factors, find moment capacity of the section $($d is $400mm$