Select the largest allowable b and d and the corresponding As $($based on providing pmin$)$ and the smallest practical b and d and the corresponding As $($associated with a tensile strain at failure of $0\mathrm{.}005)$ to give a resisting moment of Ma$=400$ ft$-$kips. For both cases select a section with b approximately equal to $0\mathrm{.}5$d$.$ Materials are fy$-60,000$ psi and f$\text{'}=4,000$ psi.