4 The foundation of the previous example is now assumed square with dimensions equal to 2x2 m. (i) Calculate an estimate of the average stress increase underneath the foundation at z = 0.5m, 1.0m, 2.0m and 4.0m using the Boussinesq solution. (ii) Calculate an estimate of the stress increase underneath the foundation at z = 0.5m, 1.0m, 2.0m and 4.0m using the 2:1 method. (iii) Calculate an estimate of the vertical settlement of the foundation