8. A tank contains 200 liters of fresh water. Brine containing 2.5 N/liter of dissolved salt runs into the tank at the rate of 8 liters/min and the mixture kept uniform by stirring runs out at 4 liters/min. Find the amount of salt when the tank contains 240 liters of brine. The concentration of salt in the tank after 25 minutes amounts to how much?

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