SOLUTION: How long will it take for the population of a certain country to triple if its annual growth rate is 3.6%? Round to the nearest year.

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Question 365939: How long will it take for the population of a certain country to triple if its annual growth rate is 3.6%? Round to the nearest year.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
The formula to use B+=+Pe%5E%28rt%29. Hence B+=+Pe%5E%280.036t%29.
Then 3P+=+Pe%5E%280.036t%29, or 3+=+e%5E%280.036t%29, or ln+3+=+0.036t. Thus t+=+ln3%2F0.036. Thus t = 30.5 years (thirty and a half years).