200kg/h of a feed containing 20 wt% solute and 80 wt% of insoluble solids is to be leached with 500kg/h of solvent in a two stage counter-current system. assume that all the solute is extracted into the solvent, and that each stage achieves perfect mixing. The underflow from each stage contains 2kg entrained solution per kg of insoluble solid. perform material balances to determine the percent recovery of solute in the overflow of the first stage