An antibiotic is being extracted from an aqueous solution to amyl acetate using a staged counter$-$current extraction set$-$up having three stages. The aqueous and organic solvent flow rates are $500\frac{L}{h}$ and $200\frac{L}{h}$ respectively while the antibiotic concentration in the aqueous feed is $0\mathrm{.}25\frac{g}{L}.$ The equilibrium line for the system is shown in the figures provided for this question $($on pg$.2).$ Determine the overall raffinate and extract concentrations. If we wish to obtain the same raffinate concentration using two counter$-$current stages, what amyl acetate flow rate would be required? Use the two graphs for the two calculations.