8. Which of the following does NOT increase the U.S. GDP? a) The U.S. government increases social security payments. b) The U.S. government purchases a tank from a U.S. company. c) The French government purchases a tank from a U.S.-based company. d) The U.S. government increases funding for tax policy at a U.S. university. 9. After graduating college, you start a job making $40,000. Your earnings grow at a constant growth rate of 3 percent per year. When you retire 40 years later, you are earning approximately: a) 100,000. b) 41,000. C) 130,000 d) 70,000. 10. If population doubles every 35 years, then the growth rate of population is a) 4 percent. b) 3 percent. c) 2 percent. d) 1 percent