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.
Here is a breakdown: Congress members (Representatives and Senators): $174,000. Senate and House Majority/Minority Leaders: $193,400. Cabinet members: $199,700. Speaker of the House: $223,500. Vice President: $230,700. President: $400,000.