Seeking advice on distillation calculations

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This post was last edited by 5mz on 2016-6-24 at 11:00. It’s been a long time since I last reviewed my old textbooks. I came across the following distillation calculation problem online: In a sieve tray distillation column, an ideal solution consisting of two components is to be separated. The feed rate is 100 kmol/h, with a composition of 0.5 (mole fraction), and it is a saturated liquid feed. The top of the tower is a total condenser, while the bottom of the tower is heated indirectly by steam. The recovery rate of the volatile components at the tower top is 90%. Given that the operating line equation for the distillation section is y=0.8x+1.9, determine: (1) the product flow rates at the top and bottom of the tower, in kmol/h ； (2) Vapor flow rate in the rectification section and stripping section, kmol/h. Please provide a detailed solution process