PROBLEM $4$

The concrete post $(E_c=3\mathrm{.}6{10}^6$ and ${}_c=5\mathrm{.}5\frac{{10}^{-6}}{}F)$ is reinforced with six steel

bars, each of $\frac{7}{8}-$in$.$ diameter and $($:${}_s=6\mathrm{.}5\frac{{10}^{-6}}{}F$