document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1034689>Question 1034689</A>: <I><SPAN STYLE=\"word-break: break-all;\"> David invested $220 in a savings account that offers a 3% return on the investment. The value of David's investment will be at least $400 after a period of years.\r<BR>\n" );
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document.write( "Hint: Use the formula A = P(1 + r)t, where A is the amount after t years, P is the amount invested, r is the rate of interest, and t is the time period. Use a calculator to compute the answer, and round it off to the nearest year.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #649348 by </B><A HREF=/tutors/aboutme.mpl?userid=fractalier><B>fractalier(6550)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fractalier><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=fractalier><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=649348\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Using <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A%28t%29+=+P%281+%2B+r%29%5Et ALIGN=MIDDLE  ALT=\"A%28t%29+=+P%281+%2B+r%29%5Et\"   DISABLED_style= \"max-width:90%; height:auto;\" > we can plug in to find t...we have<BR>\n" );
document.write( "400 = 220(1.03)^t<BR>\n" );
document.write( "Now solve for t...<BR>\n" );
document.write( "1.818 = 1.03^t<BR>\n" );
document.write( "take ln<BR>\n" );
document.write( "ln 1.818 = t * ln(1.03)<BR>\n" );
document.write( "t = 20.225 or 20 years to the nearest year... </SPAN>\n" );
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