A container holds 50 gallons of a solution composed of 10% alcohol and 90% water. A second solution composed of 50% alcohol and 50% water is added to the container at the rate of 4 gallons per minute. As the second solution is being added, the tank is being drained at a rate of 5 gallons per minute. Assuming the solution in the tank is constantly stirred, how much alcohol is in the tank after 10 minutes?