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.
For example the median expected annual pay for a typical Member Services Representative in the United States is $31,959, so 50% of the people who perform the job of Member Services Representative in the United States are expected to make less than $31,959.