document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=347477>Question 347477</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A sum of money at simple interest amounted to P7800 in 5 years and to P8840 in 9 years. Find the principal and the rate. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #248425 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=248425\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let invested amount be x<BR>\n" );
document.write( "interest = 7800-x for 5 years<BR>\n" );
document.write( "for 1 year = 7800-x /5<BR>\n" );
document.write( "...<BR>\n" );
document.write( "for 9 years interest = 8840-x<BR>\n" );
document.write( "for 1 year = 8840-x/9<BR>\n" );
document.write( ".....<BR>\n" );
document.write( "8840-x/9 = 7800-x / 5<BR>\n" );
document.write( "5(8840-x)=9(7800-x)<BR>\n" );
document.write( "44200-5x=69600-9x<BR>\n" );
document.write( "9x-5x=69600-44200<BR>\n" );
document.write( "4x=15400<BR>\n" );
document.write( "x=3850 investment\r<BR>\n" );
document.write( "\n" );
document.write( "Interest for 1 year = 7800-3850 /5<BR>\n" );
document.write( "=3950/5<BR>\n" );
document.write( "=790 \r<BR>\n" );
document.write( "\n" );
document.write( "3850 790<BR>\n" );
document.write( "100 ?<BR>\n" );
document.write( "79000/3850<BR>\n" );
document.write( "20.5% =rate </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );