document.write( "Question 603143: You have money in an account at 7% interest, compounded annually. To the nearest year, how long will it take for your money to double? \n" ); document.write( "
Algebra.Com's Answer #380583 by Alan3354(69443)\"\" \"About 
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1.07^n = 2
\n" ); document.write( "n*log(1.07) = log(2)
\n" ); document.write( "n = log(2)/log(1.07)
\n" ); document.write( "n =~ 10.244 years
\n" ); document.write( "--> 11 years to be ~2x
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