Problem $4.$

The ultimate shear and moment applied to the

below concrete beam are $V_u=30$kip and a

positive $M_u=100$kip. ft$.$

Using $f_y=60$ksi for the main positive

reinforcements, concrete strength of $f_c^{\text{'}}=$

$4$ ksi $,$ the required positive$/$bottom area of

steel for this section in $i{n}^2$ is most nearly: