$$Using the data given below and the plot of$$vs$.$in$\mathrm{.}10\mathrm{.}20,$estimate the cumulative gas production at an aban$-$donment pressure of$500$psia$.$ In addition, estimate the recov$-$ery factor at the abandonment pressure.$=4,000$psia$=500$psia$=0\mathrm{.}80$psia$.=0\mathrm{.}94$psia$.$Fig. $10\mathrm{.}20-$p$/$z plot for Exercise $10\mathrm{.}3.$