SOLUTION: Suppose that the world population is increasing at an annual rate of 1.2% if we assume an exponential growth model in how many years will the population double?

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Question 1128878: Suppose that the world population is increasing at an annual rate of 1.2% if we assume an exponential growth model in how many years will the population double?
Answer by math_helper(2461) About Me  (Show Source):
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+P+=+P%5Bo%5De%5E%28kt%29+

+2P%5Bo%5D+=+P%5Bo%5De%5E%280.012t%29+

Cancelling the P%5Bo%5D's and taking log of both sides:
+ln%282%29+=+0.012t+

+t+=+ln%282%29%2F0.012+=+0.693%2F0.012+=+highlight%28+57.8+%29+ years