In 1940,a certain country's population was 79,501,915 and its area was 2,970,435 square miles. In 2000, the country's population was 76,749,126 and its area was 3,701,592 square miles.
a. Find the population density of the country, to the nearest tenth, in 1940 AND in 2000.
b. Find the percent increase in population density, to the nearest tenth of a percent, from 1940 to 2000.