$($c$)$ A reinforce concrete rectangular beam section is $200mm$ wide and $450mm$ deep is reinforced tension steel, which consist of $4-20$ mm HYSD bars the cover to the centre of steel is $40mm.$ If effective span is $4\mathrm{.}5m$ find the concentrated load the beam can carry at its centre.

Take ${}_{chc}=7\frac{N}{m}{m}^2$ and ${}_{st}=230\frac{N}{m}{m}^2.$