A multistory building with a basement is to be constructed. The top 4 m consists of loose silt, below which a dense sand layer is present up to a great depth. Ground water table is at the surface. The foundation consists of the basement slab of 6 m width which will rest on the top of dense sand as shown in the figure. For dense sand, saturated unit weight = 20 kN/m³, and bearing capacity factors \(N_q\) = 40 and \(N_{\gamma}\) = 45. For loose silt, saturated unit weight = 18 kN/m³, \(N_q\) = 15 and \(N_{\gamma}\) = 20. Effective cohesion c' is zero for both soils. Unit weight of water is 10 kN/m³. Neglect shape factor and depth factor. Using a factor of safety = 3, the net safe bearing capacity (in kN/m²) of the foundation is: