document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=85607>Question 85607</A>: <I><SPAN STYLE=\"word-break: break-all;\"> help me please if you can.\r<BR>\n" );
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document.write( "Doubling Time Suppose a conservation campaign coupled<BR>\n" );
document.write( "with higher rates causes the demand for electricity to<BR>\n" );
document.write( "increase at only 2% per year, as it has recently. Find the<BR>\n" );
document.write( "number of years before the utilities will need to double<BR>\n" );
document.write( "generating capacity. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #61850 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=61850\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let current rate be c<BR>\n" );
document.write( "EQUATION:<BR>\n" );
document.write( "If current rate doubles it becomes 2c.<BR>\n" );
document.write( "If the growth rate is 0.02 and it takes t years to double you get:<BR>\n" );
document.write( "2c = c(1.02)^t<BR>\n" );
document.write( "2 = 1.02^t<BR>\n" );
document.write( "Take the log of both sides to get:<BR>\n" );
document.write( "log2 = t*log1.02<BR>\n" );
document.write( "t= [log2]/[log1.02]<BR>\n" );
document.write( "t = 35 years<BR>\n" );
document.write( "=============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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