(10 pts) An air classifier is receiving shredded waste comprised of 40% plastic, 20% aluminum, 35% paper, and 5% steel. The air velocity in the classifier is 150 cm/s. a. (2 pts) If the recovered light fraction (paper and plastic) is to be used for fuel, find the percent recovery of material that can be used for fuel. b. (2 pts) Calculate the purity of the fuel product in the recovered material. c. (4 pts) Calculate the overall efficiency of the air classifier for recovering product for fuel. d. (2 pt) If the air velocity is increased to 200 cm/s, would the overall efficiency of separation of fuel from non-fuel materials increase, decrease, or stay the same? Why? (No additional calculations are needed; you may use Pichtel figure 7.37 to respond to part c.)