document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=593328>Question 593328</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You are investing money at 8.5 percent annual interest, compounded continuously. It will take you how many  years to double your investment.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #376283 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=376283\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let P be the amount initially invested. Since we want this investment to double, the final amount is A = 2P\r<BR>\n" );
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document.write( "One other thing to keep in mind is that the rate 8.5% means r = 0.085\r<BR>\n" );
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document.write( "So plug A = 2P and r = 0.085 into <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+Pe%5E%28rt%29 ALIGN=MIDDLE  ALT=\"A+=+Pe%5E%28rt%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > and then solve for t\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+Pe%5E%28rt%29 ALIGN=MIDDLE  ALT=\"A+=+Pe%5E%28rt%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2P+=+P%2Ae%5E%280.085t%29 ALIGN=MIDDLE  ALT=\"2P+=+P%2Ae%5E%280.085t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2P%2FP+=+e%5E%280.085t%29 ALIGN=MIDDLE  ALT=\"2P%2FP+=+e%5E%280.085t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2+=+e%5E%280.085t%29 ALIGN=MIDDLE  ALT=\"2+=+e%5E%280.085t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%282%29+=+ln%28e%5E%280.085t%29%29 ALIGN=MIDDLE  ALT=\"ln%282%29+=+ln%28e%5E%280.085t%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%282%29+=+0.085t%2Aln%28e%29 ALIGN=MIDDLE  ALT=\"ln%282%29+=+0.085t%2Aln%28e%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%282%29+=+0.085t%2A%281%29 ALIGN=MIDDLE  ALT=\"ln%282%29+=+0.085t%2A%281%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%282%29+=+0.085t ALIGN=MIDDLE  ALT=\"ln%282%29+=+0.085t\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ln%282%29%2F0.085+=+t ALIGN=MIDDLE  ALT=\"ln%282%29%2F0.085+=+t\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.693147180559945%2F0.085+=+t ALIGN=MIDDLE  ALT=\"0.693147180559945%2F0.085+=+t\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=8.15467271246994+=+t ALIGN=MIDDLE  ALT=\"8.15467271246994+=+t\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+8.15467271246994 ALIGN=MIDDLE  ALT=\"t+=+8.15467271246994\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "So it will take you roughly 8.15 years to double your investment.\r<BR>\n" );
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document.write( "If your answer must be a whole number of years, then round up to 9 years.<BR>\n" );
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