An $8\backslash$times $4\backslash$times $(1)/(2)$ has staggered holes for $-$in$.$ diameter bolts, as shown in Figure P$9\mathrm{.}4.$

Determine the net area $($Ag $=5\mathrm{.}80$ in$\mathrm{.}2,$ centroid x $=0\mathrm{.}854$ in$.).$using A$913$ steel $[$Fy$=70$ksi and Fu$=90$ksi$]$ and equation $9\mathrm{.}5$ for U$.$