Consider the column cross$-$section shown below. Assume the concrete has a compressive strength of $5000$ psi, and the steel is Grade $60$ steel. Find the value of $P_n$ and $M_n($for bending about the $x-$axis$)$ on the interaction diagram for this column corresponding to the failure case where the concrete is crushing on one face and the strain at the other face is a tensile strain of $0\mathrm{.}004.$