In a countercurrent multistage leaching process, fresh sunflower seeds (500kg/h) containing 23.5 wt \% of oil are extracted using pure hexane to remove 90% of the oil. The final exit overflow solution contains 50wt% oil. Table 2 shows the experiment data on the underflow profile of the process. Table 2: Underflow profile (a) Calculate the amounts and compositions of the exit streams. (6 Marks) (b) Determine the number of theoretical stages needed for the separation. 6 Marks) (c) Suggest a pre-treatment process that can help to increase the rate of leaching and explain how does the suggested pre-treatment help in the leaching rate increment