Each person in a room is assumed to be producing carbon dioxide at the average rate of 0.0107 cfm (5.0 mL/s) and air with aCO₂ concentration of 280 ppm is being supplied to the room at the rate of 6000 cfm (2.8 m³ /s). It is desired to keep the concentration level of CO₂ in the space below 1000 ppm. Assuming complete mixing, determine how many persons could occupy the room and not exceed the desiredCO₂ level.