Design a rectangular combined footing to support two columns, as shown in Fig.. The edge column has a section $1616$ in$.$ and carries a DL of $180K$ and an LL of $120K.$ The interior column has a section $2020in.$ and carries a DL of $250K$ and an LL of $140K.$ The allowable soil pressure is $5ksf$ and the bottom of the footing is $5ft$ below final grade. Design the footing using $f_c^{\text{'}}{?}^{\text{'}}=4$ksi,$f_y=60$ksi.

Draw the factored shearing force diagram

Draw the factored moment diagram