$*$Note that $f_y$ is NOT $60,000$ psi $($NOT Grade $60$ steel$)$ for Problems $1$ and $2-{}_{yt}$ is not $0\mathrm{.}00206$

$**E_s=29,000$ksi for any grade steels

$*$Please see the last page for ${}_l$ and $$

Table $22\mathrm{.}2\mathrm{.}2\mathrm{.}4\mathrm{.}3-$Values of ${}_1$ for equivalent rect$-$

angular concrete stress distribution

Problem $1.$ Determine the values of ${}_t,,$ and $M_n.$ Also, briefly discuss the results.