A tank with a capacity of 4000 liters holds 2000 liters of brine that contains 50kg of dissolved salt. Brine with a salt concentration of 0.2kg per liter is piped into the tank at a rate of 30 liters per minute. Wellmixed brine is drawn off at 30 liters per minute. Create a model DE that shows the change of salt with respect to time and solve it.

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