A reverse osmosis $(RO)$ system, as shown in Figure $Q_2,$ is used for desalination of saline water to produce drinking water. The feedwater contains total dissolved solid $($TDS$)$ of $2\mathrm{.}000m\frac{g}{L}$ and boron of $10m\frac{g}{L}.$ The feed to the RO system has a flowrate of $800\frac{m^3}{d}.$ Stage $1$ has recovery of $50\%,$ Stage $2$ has recovery of $40\%$ and Stage $3$ has recovery of $90\%.$ Assime the concentration polarization factor is $1\mathrm{.}2$ in all stages. All the RO membranes used in the system have intrinsic rejection of $99\%$ for TDS and $75\%$ for boron. The semperature is at $25C.$ Determine the flowrates and TDS contents of feed,retentate and permeate in each stage of RO system. Determine the recovery and rejection of TDS of the RO system.