A tank contains 80 kg of salt and 2000 L of water. A solution of a concentration 0.02 kg of salt per liter enters a tank at the rate 9 L/min. The solution is mixed and drains from the tank at the same rate. (a) What is the concentration of our solution in the tank initially? concentration = 0.04 (kg/L) (b) Find the amount of salt in the tank after 2 hours. amount = 66.28 X ( kg ) (c) Find the concentration of salt in the solution in the tank as time approaches infinity. concentration = 0.02 (kg/L)