Asked by Anonymous

Pretend the world's population in 1989 was 5 billion and that the projection for 2017 is 7.5 billion.

What annual rate of growth is assumed in this prediction?

Answers

Answered by Reiny
Assuming we take the growth to be exponential , ...

5 e^(28r) = 7.5

e^(28r) = 1.5
ln both sides

ln (e^(28r)) = ln1.5
28r = ln 1.5
r = .0145

the rate is 1.45%

check:
5 e^(28*.0145)
= 7.5
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