800ml of trichloroethylene (density of 1.5 g/ml) must be added to a continuously operating degreaser every 8-hour shift to account for solvent loss. The degreaser is located in a 3,000 m^3 room that has a wall-mounted fan exhausting 400 m^3/min. The concentration is negligible (C=0) at the start of the shift. What is the trichloroethylene concentration in the room after 50 minutes of operation?