$(3)($C$)$ Design a simply supported roof slab for a room $4\mathrm{.}5m6m$ measuring from inside. Thickness of wall is $300mm.$ The Superimpored load Exclusive of the self weight is $2\mathrm{.}5k\frac{N}{m^2}$

The slab may be assumed to be simply Supported all four Edges with corres held down. Lese $M-20$ mixe and $F{e}^{-415}$ grade

steel.