How much money do you make a year selling oxygen

Fifty thousand to eighty thousand. Oxygen station is mainly sold in the medical aspect, oxygen station can earn fifty thousand to eighty thousand a year, small gas station profit fifty thousand to eighty thousand a year, medium and large on this basis to add a moderate amount of profit. Medical oxygen is mainly used for middle-aged and elderly people and mental laborers or long-term overwork and intense learning students, physical exercise competition athletes and so on.