Problem $5\mathrm{.}20$ Repeat Problem $5\mathrm{.}18$ if $f_y=50,000$ and

$f_c^{\text{'}}=4000.$

Problem $5\mathrm{.}18$ Determine the theoretical area of reinforcing

steel required for the $T$ beam shown if $f_c^{\text{'}}=4000,$

$f_y=60,000,M_a=400ft-k,$ and $L=28ft.$ Clear distance

between flanges $=3ft.$