it's a Mass transfer 2 numerical based problem please solve it in a easy way

2. Pure isopropyl ether (A) 650kg/h is being used to extract an aqueous solution of 220kg/h with 35wt% acetic acid (C) by counter current multistage extraction at 25C. The exit acid concentration in the aqueous phase is 10wt%. i) Find the quantity and composition of extract and raffinate. ii) Calculate the number of stages required. Equilibrium data at 25C is given below