A desalination plant treats sea water with a concentration of $30,000mg{L}^{-1}$ at a flowrate of $1\mathrm{.}5m^3{s}^{-1}.$ The recovery $($percentage of feedwater that passes through the membrane to become permeate$)$ is $80\%,$ and the salt rejection is $)=(0\mathrm{.}98.$ What is the concentration of salt in the concentrate assuming no salt accumulates on the membrane?