document.write( "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. \n" ); document.write( "

Algebra.Com's Answer #260786 by robertb(5830) $\"\"$ $\"About$

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The formula to use $\"B+=+Pe%5E%28rt%29\"$ . Hence $\"B+=+Pe%5E%280.036t%29\"$ .
\n" ); document.write( "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). \n" ); document.write( "

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