b$)$ If a soil sample has a dry unit weight of $19\mathrm{.}5k\frac{N}{m^3},$ moisture content of $8\%$ and a specific gravity of solids particles is $2\mathrm{.}67.$ Calculate the following: i$)$ The void ratio. ii$)$ saturated unit weight. iii$)$ the mass of water to be added to cubic meter of soil to reach $80\%$ saturation.