don't give wrong answer I'll give downvote , don't copy need hand written solution ...

A square footing 1.6m1.6m is built on a homogeneous bed of soil having sat =20kN/m3,=19kN/m3 cohesion 7kPa and angle of shearing resistance of 33. The depth of foundation and the water table are at 1.8m and 2m below the ground surface. Using Terzaghi's method and assuming general shear failure, calculate the factor of safety if the net allowable load on footing is 320kN