Alcohol containing 15% salt is fed at a rate of 10 kg/min in a mixer (CSTR) that initially holds 100 L of alcohol containing 5% salt. The exit solution leaves the mixer at a rate of 10 kg/min. Determine the exit concentration after 30 minutes in ppm and assume complete mixing. The density of alcohol is 0.8 g/mL and can be assumed constant due to low salt concentration