document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1004839>Question 1004839</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how long will it take a principal to earn half of itself if invested at 12 percent simple interest? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #621249 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=621249\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Normally we use the formula<BR>\n" );
document.write( "I = prt<BR>\n" );
document.write( "Since we want our interest to be equal to half our principal, we write<BR>\n" );
document.write( "(1/2)p = prt<BR>\n" );
document.write( "and plugging in we get<BR>\n" );
document.write( "(1/2)p = p(.12)t<BR>\n" );
document.write( "(1/2) = .12t<BR>\n" );
document.write( "t = .5/.12 = 4 1/6 years </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );