$(2$ points$)$ You are working for the Texas Commission on Environmental Quality $($TCEQ$)$ and must

issue a discharge permit to a business. The business wishes to discharge salt into the San Antonio River.

The flow of wastewater from the business is $0\mathrm{.}3\frac{m^3}{s}.$ The flow of water in the San Antonio River

$($upstream$)$ is $2\frac{m^3}{s}.$ Upstream the concentration of salt in the river is $10m\frac{g}{L}.$ What is the maximum

concentration the industry can discharge if the concentration of salt in the river $($after mixing$)$ cannot

exceed $100m\frac{g}{L}?$ Include a diagram depicting the problem. The system is completely mixed.