One hundred kg/hr of a 50w% solution of solute C in solvent A is to be extracted at 25C in a continuous LLE system with a pure second solvent B to obtain a final raffinate of 5wt% of C. Using the following equilibrium data, determine: a) the number of counter-eurrent stages required when the mass rate of the extractive solvent B is 25% of the feed solution b) the number of cross-flow stages required when the mass rate of the extractive solvent B is 25% of the feed solution for each stage