The separation process of sequence of two stage distillation column is given in Figure. The material balance in process is given in the Table. Calculate the separation faetion for frobuine relative to $n-$butane in Golumn $1.$

$\backslash$table$[[,$Strenm $(1$bmolin$)],[$Component$,1,2,3,4,5],[C_3{H}_3,80,0,80,70,10],[C_4{H}_{10},120,6,114,14,100],[n{C}_4{H}_{10},160,5,155,5,150],[C_3{H}_{12},40,40,0,0,0]]$