In 2007, the population of North America was approximately 5.15 x 108 people and the population of South America was approximately 3.04 x 108 people.
What is the combined population of North and South America for this year?

A) 8.19 x 1016 people
B) 8.19 x 109 people
C) 8.19 x 108 people
D) 8.19 x 1064 people