document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1085446>Question 1085446</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A sum of money amounts to rs 5200 in 5 yeas and rs 5680 in 7 years at simple interest. What was the rate of simple interest charged per annum </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #699631 by </B><A HREF=/tutors/aboutme.mpl?userid=jorel1380><B>jorel1380(3719)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jorel1380><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=jorel1380><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=699631\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let P be the principal, and r be the interest rate. Then:<BR>\n" );
document.write( "P(1+5r)=5200 and<BR>\n" );
document.write( "P(1+7r)=5680<BR>\n" );
document.write( "P+5Pr=5200<BR>\n" );
document.write( "P+7Pr=5680<BR>\n" );
document.write( "2Pr=480<BR>\n" );
document.write( "Pr=240<BR>\n" );
document.write( "r=240/P<BR>\n" );
document.write( "P+1200=5200<BR>\n" );
document.write( "P=4000<BR>\n" );
document.write( "Solve for r. &#128578;&#128578;&#128578;&#128578; </SPAN>\n" );
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