As altitude increases, the available amount of oxygen to sustain mental and physical alertness decreases with the overall air pressure, though the relative percentage of oxygen in air, at about 21%, remains practically unchanged up to 21,000 metres (70,000 ft).
  State legislators in Texas (both representatives and senators) make a salary of $7,200 per year.
HOW MUCH DO GUEST SERVICE REPRESENTATIVES MAKE? The Bureau of Labor Statistics (BLS) states that in 2010, the median income for a guest service representative was $14.64 an hour, or $30,460 a year.