Multiple-Stage Extraction with cross-current flow arangement: Pure water is to be used to extract acetic acid from 400kg of a feed solution containing 25wt% acetic acid in isopropyl ether. Use equilibrium data from question 2. (a) If 400kg of water is used, calculate the percent recovery in the water solution in a one-stage process. (b) If a multiple four-stage system is used and 100kg fresh water is used in each stage, calculate the overall percent recovery of the acid in the total outlet water. (Hint: First, calculate the outlet extract and raffinate streams for the first stage using 400kg of feed solution and 100kg of water. For the second stage, 100kg of water contacts the outlet organic phase from the first stage. For the third stage, 100kg of water contacts the outlet organic phase from the second stage, and so on.)