A 500-liter tank initially contains 10 grams of salt dissolved in 200 liters of water. Starting at t=0, water that contains 1/4 grams of salt per liter is poured into the tank at the rate of 4 liters/min, and the mixture is drained from the tank at the rate of 2 liters/min. Let y(t) represent the amount of salt inside the tank at time t. Find a differential model for y(t) and solve it to find y(t). Graph y(t). What is the amount of salt after 10 minutes? What is the concentration of salt inside the tank after 10 minutes?

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