12. [011 Points] - DETAILS PREVIOUS ANSWERS SCALC ET9 9.3.049. MY NOTES ASK YOU R TEACHER PRACTICE ANOTHER A vat with 400 gallons of beer contains 4% alcohol (by volume). Beer with 6% alcohol is pumped into the vat at a rate of 4 gal/min and the mixture is pumped out at the same rate. What is the percentage of alcohol after an hour? (Round your answer to one decimal place.) _x Need Help? Submit Answer l