$1\mathrm{.}1.$ Table $1$ shows $-$values and the composition of vapor on the top plate of a distillation column. The column operates under atmospheric conditions and has a reflux ratio of $R=1\mathrm{.}9.$ Calculate the liquid composition of the two top plates.

Table $1$: Composition on the top plate of a distillation and the $-$values

$\backslash$table$[[\backslash$table$[[$Feed stream$],[$No$.]],$Feed,Mol $\%,\backslash$alpha $],[$F$1,$CH$\_(4),7,3\mathrm{.}15],[$F$2,$C$\_(2)$H$\_(4),10,2\mathrm{.}75],[$F$3,$C$\_(2)$H$\_(6),20,2\mathrm{.}35],[$F$4,$C$\_(3)$H$\_(6),35,1\mathrm{.}4],[$F$5,$C$\_(3)$H$\_(8),25,1],[$F$6,$n$-$C$\_(4)$H$\_(10),3,0\mathrm{.}75]]$