A tank initially contains 200 L of pure water. Salt enters into the solution constantly 5 kilograms for every minute, then will be mixed well into the contents of the tank. If the well-mixed solution...

A tank initially contains 200 L of pure water. Salt enters into the solution constantly 5 kilograms for every minute, then will be mixed well into the contents of the tank. If the well-mixed solution exits from the tank at the rate 10 L per minute, determine the salt concentration (kilograms) at the instant the tank contains a volume of 80 L.

(Answer in four decimal places.)