In a debutanizer operation, it is required to recover 97% of n-butane (present in the feed) in the distillate, and 98% of i-pentane (present in the feed) in the bottoms. Calculate the number of actual trays required in the debutanizer. Mean tower conditions are 200°F and 125 psia. Assume an overall plate efficiency of 70% and remember that the tower will not operate at total reflux. You need to use the handout K Values for Light Hydrocarbons.