A pilot-scale countercurrent multiple-stage liquid-liquid extraction (CMLLE) process is being designed to decrease the concentration of compound A present in an aqueous mixture from 50% to 5% (by mass) using solvent B at 32.6C. The process is designed to operate with 25g/min of solution being treated with an equal quantity of solvent B. Under these operational conditions, determine: (i) the number of theoretical CMLLE stages needed using the Hunter-Nash method, [27 marks] (ii) concentration of extract obtained from the first CMLLE stage, and [3 marks] (iii) the mass flowrate. [5 marks]