A pollutant with an initial concentration of 1,000 mg/L is degraded according to a first-order reaction with a rate constant (K) equal to 2.5/hr. An industry plans to use a plug flow reactor (PFR, Vol = 8.2x104 gallons) followed by a continuously-stirred tank reactor (CSTR, Vol = 8.2x104 gallons) to treat the pollutant. The wastewater flow is 6.0 mgd and the system can be considered to be at steady-state. Calculate the effluent pollutant concentration (in mg/L) after treatment in the PFR-CSTR treatment train. Report your answer to the nearest tenths (0.1) place.