a Design an appropriate footing/footings to support two columns A and B spaced at distance 2.1 m center-to-center. Column A is 20 cm x 30 cm and carries a dead load of 200 kN and a live load of 100 kN. Column B is 20 cm x 40 cm in cross section but carries a dead load of 300 kN and a live load of 150 kN. Width of footing is not to exceed 1.0 m, and there is no property line restriction. Use f:= 28 MPa, f= 420 MPa, 9 all (net) =200 kN/m, Ysoil = 17 kN /m', and De =2.0 m. a