Initially 50 pounds of salt is dissolved in a tank holding 300 gallons of water. A brine solution is pumped into the tank at a rate of 3 gallons per minute, and a well-stirred solution is then pumped out at the same rate. If the centration of the solution entering is 2 pounds per gallon, determine the amount of salt in the tank at any time. How much salt is present after 50 minutes?

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