According to the U.S. Census Bureau, as of March 2014 there
are approximately 7,150,000,000 people living in the entire world and 317,700,000
living in the U.S but these numbers change continuously.
Divide the number of people in the U.S. by the number of
people in the world and multiply by 100 to get the answer.
= 317700000 / 7150000000 x 100
= 4.44%
