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A tank with a capacity of 10 liter, initially contains 80% water and 20% salt solution. A 50% salt solution enters the tank at a

A tank with a capacity of 10 liter, initially contains 80% water and 20% salt solution. A 50% salt solution enters the tank at a rate of 2 liter per minute. The solution then leaves the tank at a rate of 2 liter per minute. How much salt (in liters) is in the tank after 10 minues?

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