Solve the problem.A 1000-gallon holding tank contains 100 gallons of water. Initially, each gallon of water in the tank contains 3 pounds of pollutants. Water containing 4 pounds of pollutants per gallon enters the tank at a rate of 50 gallons per hour, and the uniformly mixed water is released from the tank at a rate of 25 gallons per hour. How many pounds of pollutants are in the tank after 4 hours? At what rate (in pounds per gallon) are the pollutants being released after 4 hours?
A. There are 750 pounds of pollutants in the tank after 4 hours. The pollutants are being released at a rate of 3.75 pounds per gallon after 4 hours.
B. There are 180 pounds of pollutants in the tank after 4 hours. The pollutants are being released at a rate of 4.35 pounds per gallon after 4 hours.
C. There are 650 pounds of pollutants in the tank after 4 hours. The pollutants are being released at a rate of 5.75 pounds per gallon after 4 hours.
D. There are 250 pounds of pollutants in the tank after 4 hours. The pollutants are being released at a rate of 1.25 pounds per gallon after 4 hours.
Answer: A
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A. 
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C. 
D. 