For a specification of not more than $1$mol of the light key in the bottom product and not more than $1$mol of the heavy key in the top product, and a reflux ratio of $2\mathrm{.}5,$ make a stage$-$by$-$stage calculation to determine the product composition for only $3$ stages

Pressure $=$ at $8\mathrm{.}3$ bar

calculate the dew points or the bubble points of the Distillate and Bottom streams

top to bottom calculation

$\backslash$table$[[$Propane$,$ C$3,3],[$i$-$Butane, iC$4,8],[$n$-$Butane, nC$4,32],[$i$-$Pentane, iC$5,27],[$n$-$Pentane, nC$5,30],[,100]]$

I need calculation