document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=140090>Question 140090</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Need help with this. Thanks!\r<BR>\n" );
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document.write( "A woman deposits $50,000 in a savings account with 4% continuously compound interest. How many years must she wait until the balance has doubled?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #102091 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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/cgi-bin/show-face.mpl?user=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=102091\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the formula you need is A=Pe^(rt)<BR>\n" );
document.write( "__ A is the Amount after time t<BR>\n" );
document.write( "__ P is the Principal you start with<BR>\n" );
document.write( "__ e is Euler's number (the base for natural logarithms)<BR>\n" );
document.write( "__ r is the rate of interest<BR>\n" );
document.write( "__ r and t have to use the same time units\r<BR>\n" );
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document.write( "100000=50000e^(.04t) __ dividing by 50000 __ 2=e^(.04t)\r<BR>\n" );
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document.write( "taking natural log __ ln(2)=.04t __ dividing by .04 __ [ln(2)]/.04=t </SPAN>\n" );
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