document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=236134>Question 236134</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How long will it take for the population of a certain country to double if its annual growth rate is 3.5%? (Round to the nearest year.) Use the exponential growth model P(t) = P   e kt.<BR>\n" );
document.write( "                      0 <BR>\n" );
document.write( "       1 year<BR>\n" );
document.write( "       9 years<BR>\n" );
document.write( "       57 years<BR>\n" );
document.write( "       20 years<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #173856 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=173856\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> How long will it take for the population of a certain country to double if its annual growth rate is 3.5%? (Round to the nearest year.) Use the exponential growth model P(t) = P e kt.<BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "Future P = P*e^kt<BR>\n" );
document.write( "2*P = P*e^0.035t<BR>\n" );
document.write( "2 = e^0.035t<BR>\n" );
document.write( "ln(2) = 0.035t<BR>\n" );
document.write( "t = ln(2)/0.035<BR>\n" );
document.write( "t = 19.8 years ~ 20 years </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );