A distillation column with total condenser and partial reboiler is to be designed to fractionate a benzene-toluene mixture. The feed is a saturated liquid and contains 50 mole % benzene and is you want to get a cap percent of 90 mole percent benzene and a residual with 10 mole % benzene. If the reason for internal reflux in the area of rectification is 0.6. Determine according to McCabe's method Thiele.