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A tank contains 100 kg of salt and 1000 L of water. A solution of a concentration 0.05 kg of salt per liter enters a tank at the rate 7 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 = 0.1 (kg/L) (b) Find the amount of salt in the tank after 4 hours. amount = (kg) (c) Find the concentration of salt in the solution in the tank as time approaches infinity. concentration = 0.05 (kg/L)