please solve step by step with the graph

2. A binary mixture that is 40mole% light component is to be separated into 5 mole\% bottoms product and 90 mole\% distillate product. The feed flow rate is 100hrkmol, and the feed is 50% vapor, 50% liquid as it enters the column. The reflux ratio is 2.625. The VLE for the column can be approximated as a constant volatility of 2.5. Assume a partial reboiler. total condenser, and saturated liquid reflux. What is the optimum feed tray location, and how many trays are required