Design a continuous wall footing to support a $12$ wide reinforced concrete foundation wall. The dead load is$20$ kips$/$foot and a live load of $15$ kips$/$foot$.$ The bottom of the footing is $4$ feet below final grade and the soil$($sand$)$ has a total unit weight of $120$ pounds per cubic foot. The allowable soil pressure $($qA$)$ is $3000$ pounds$$ per square foot, the reinforcing steel is Grade $60,$ and the concrete compressive strength is $4,000$ psi.$$Design a continuous wall footing to support a $12$ wide reinforced concrete foundation wall. The dead load is$20$ kips$/$foot and a live load of $15$ kips$/$foot$.$ The bottom of the footing is $4$ feet below final grade and the soil$($sand$)$ has a total unit weight of $120$ pounds per cubic foot. The allowable soil pressure $($qA$)$ is $3000$ pounds$$ per square foot, the reinforcing steel is Grade $60,$ and the concrete compressive strength is $4,000$ psi.