document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=963867>Question 963867</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A principal of <BR>\n" );
document.write( "$1300<BR>\n" );
document.write( " is invested at <BR>\n" );
document.write( "8.75%<BR>\n" );
document.write( " interest, compounded annually. How many years will it take to accumulate <BR>\n" );
document.write( "$4000<BR>\n" );
document.write( " or more in the account? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #588842 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=588842\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A principal of <BR>\n" );
document.write( "$1300<BR>\n" );
document.write( " is invested at <BR>\n" );
document.write( "8.75%<BR>\n" );
document.write( " interest, compounded annually. How many years will it take to accumulate <BR>\n" );
document.write( "$4000<BR>\n" );
document.write( " or more in the account?<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Use:<BR>\n" );
document.write( "A = P(1+i)^t<BR>\n" );
document.write( "where<BR>\n" );
document.write( "A is amount after time t (4000)<BR>\n" );
document.write( "P is principal (1300)<BR>\n" );
document.write( "i is interest (.075)<BR>\n" );
document.write( "t is time (years) -- this is what we're looking for<BR>\n" );
document.write( ".<BR>\n" );
document.write( "4000 = 1300(1+.075)^t<BR>\n" );
document.write( "4000 = 1300(1.075)^t<BR>\n" );
document.write( "40 = 13(1.075)^t<BR>\n" );
document.write( "40/13 = (1.075)^t<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=log%281.075%2C%2840%2F13%29%29 ALIGN=MIDDLE  ALT=\"log%281.075%2C%2840%2F13%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >  = t<BR>\n" );
document.write( "15.54 years = t<BR>\n" );
document.write( "answer: approximately 16 years<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );