Question

1. In 1960 , there were approximately 3,000 million people living on earth. In 1999 , the population of earth was approximately 6,000 million people. What was the approximate rate of increase, in millions of people, each year between these two years?

9,000 million people per year
3,000 million people per year
231 million people per year
77 million people per year

Answer 1

Explanation:

to solve this problem we use the growth exponential formula: A=P(1+r%)^t

3000×(1+(r/100))^39=6000

by dividing both sides by 3000

(1+(r/100))^39=2

1+r/100=2^(1/39)

r/100=2^(1/39)-1

r=100(-1+2^(1/39))

r=1.79318

by multiplying by 1,000,000

r=1,793,18 approximately