You are considering three design alternatives for treating a pollutant in wastewater using a first-order process (k = 1 min-1). The total flow is 10 million gallons per day (mgd). The three alternatives, each of which has a total tankage of 10,000 gallons, are: (1) one 10,000 gallon basin; (2) two 5,000 gallon basins in series; and (3) four 2,500 gallon basins in series. Calculate the percent removal of the pollutant for each alternative at steady state.