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A mixture of acetic acid (A) and water (B) containing 35% acetic acid by weight and having a flow rate of 500 kg/hour, Multistage operating on the countercurrent principle using a minimum amount of isopropyl ether (S) Extract until 5% by weight acetic acid remains in the raffinate phase in the extraction unit. is being done. In the extraction process, the solvent flow rate is 1.6 times the flow rate of the minimum solvent. if used; a) The amount and composition of the extract and raffinate phases to be processed at the end of the process, b) Find the number of theoretical equilibrium stages required for the process.

\begin{tabular}{|c|c|c|c|c|c|} \hline \multicolumn{2}{|c|}{ Rafinate phase (\% by weight) } & \multicolumn{3}{c|}{ Extract phase (\% by weight) } \\ \hline A & B & S & A & B & S \\ \hline 0 & 98.8 & 1.2 & 0 & 0.6 & 99.4 \\ \hline 0.69 & 98.1 & 1.2 & 0.18 & 0.5 & 99.3 \\ \hline 1.41 & 97.1 & 1.5 & 0.37 & 0.7 & 98.9 \\ \hline 2.89 & 95.5 & 1.6 & 0.79 & 0.8 & 98.4 \\ \hline 6.42 & 91.7 & 1.9 & 1.93 & 1.0 & 97.1 \\ \hline 13.3 & 84.4 & 2.3 & 4.82 & 1.9 & 93.3 \\ \hline 25.5 & 71.1 & 3.4 & 11.4 & 3.9 & 84.7 \\ \hline 36.7 & 58.9 & 4.4 & 21.6 & 6.9 & 71.5 \\ \hline 44.3 & 45.1 & 10.6 & 31.1 & 10.8 & 58.1 \\ \hline 46.4 & 37.1 & 16.5 & 36.2 & 15.1 & 48.7 \\ \hline \end{tabular}