document.write( "Question 453339: if you invest money into an account that receives a steady annual interest rate of 3.5%, how many years will it take to double your investment?
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Algebra.Com's Answer #311515 by robertb(5830)\"\" \"About 
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\"2P+=+P%281%2B+r%29%5Et\"\r
\n" ); document.write( "\n" ); document.write( "<==> \"2+=+%281+%2B+0.035%29%5Et\" ==> \"2+=+1.035%5Et\" ==> \"t+=+ln2%2Fln1.035+=+20.15\" years, to the nearest tenth.
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