mass transfer

could you please solve all step by step

a) A distillation column at 1 atm pressure with a partial reboiler and a total condenser is being used to separate a mixture of benzene, toluene, cumene. The feed is 40mol% benzene, 30mol% toluene, and 30 mol\% cumene and is input as a saturated vapor. We desire 95% recovery of toluene in the distillate, and 95% recovery of cumene in the bottoms. The reflux is returned as a saturated liquid and constant molal overflow (CMO) can be assumed. Equilibrium can be represented as constant relative volatilities. Choosing toluene as the reference component. b) For the multi-component distillation column given in part (a) use the Underwood method to find the minimum reflux ratio. Assume saturated vapor feed (q=0) and F=100kgmol/h, and the mole fractions of benzene, toluene and cumene in the distillate are: 0.571,0.408,0.021 respectively. Minimumnunber of stages using Fenskie merhod : L=aikaikaLK.AK2 Underwood method: Page 4 of 8 ajaixn=1q Vulue of pis found by trial A error between 2K,aix