document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=136123>Question 136123</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The question is:<BR>\n" );
document.write( " How long will it take P dollars to double itself at 9% simple interest?\r<BR>\n" );
document.write( "\n" );
document.write( "--I know the formula is i=prt, I'm just not sure how to solve this equation without the Principal amount.  Thanks so much </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #99751 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=99751\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the formula is: i=p(1+r)^t<BR>\n" );
document.write( "2p=p(1+.09)^t<BR>\n" );
document.write( "2p/p=(1.09)t<BR>\n" );
document.write( "2=(1.09)^t<BR>\n" );
document.write( "2=(1.09)^8.04324 (8 years & 16 days).<BR>\n" );
document.write( "2=2.000001<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );