=+4-17.

Carbon dioxide is being generated in an occupied space at the rate 0.25 cfm (0.118 l/s) and out-

door air with a CO, concentration of 220 ppm is being supplied to the space at the rate of 900 cfm (0.425 m3/s). What will be the steady-state concentration of CO, in ppm if complete mix-

ing is assumed?