A sample of dry sand having a unit weight of 18.2 kN/m' and a solids specific gravity of 2.72 isplaced in the rain. During the rain, the volume of the sample remains constant and no solid particlesare lost. However, the degree of saturation increases to 50%. Determine:a. The change in void ratio caused by the rain.b. The void ratio (e) after the rain.c. The total unit weight (21) after the rain.d. The water content (w) after the rain.