Please do all clear calculations: $(2)$

Exercise $3$ A square foundation is shown in figure. The footing will carry a gross mass of $50\mathrm{.}000$ kg$,$ using a factor of safety of $2\mathrm{.}8,$ determine the size of the footing $($B$).$ given Density of soil $=1740$ kg$/$m$3,=20\backslash$deg $,$