feed flow rate

We wish to remove acetic acid from water using pure isopropyl ether as solvent. The operation is at 293 K and 1 atm The feed is 45 wt% acetic acid and 55 wt% water. The feed flow rate is 2000 kg/h. A multistage countercurrent extraction cascade is used to produce a final extract that is 20 wt% acetic acid and a final raffinate that is also 20 wt% acetic acid. Calculate how much solvent and how many equilibrium stages are required.