document.write( "Question 476726: How do I find out how many months it will take me to double my money at 5%APR? What is the formula? Thank you. \n" ); document.write( "
Algebra.Com's Answer #326874 by Alan3354(69443)\"\" \"About 
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If it's compounded monthly, the monthly interest rate = 0.05/12
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\n" ); document.write( "2 = (1 + 0.05/12)^n (n = # of months)
\n" ); document.write( "log(2) = n*log(1 + 0.05/12)
\n" ); document.write( "n = log(2)/log(1 + 0.05/12)
\n" ); document.write( "n =~ 166.7 months
\n" ); document.write( "= 167 months
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