The salary of the president of the United States in 2000 was $400,000. In 1940, the president's salary was $75,000. If the Consumer Price Index was 8.1 in 1940 and 100 in 2000, the 1940 presidential salary measured in terms of the purchasing power of the dollar in 2000 would be: a. less than $75,000. b. less than $400,000. c. approximately $668,850. d. approximately $926,000.