document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=34420>Question 34420</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Walt made an extra $9000 last year from a part-time job. He invested part of the money at a 9% annual rate of interest, and the rest at an 8% annual rate of interest. At the end of the year, he made a total of $770 in interest. How much was invested at 8%? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #20707 by </B><A HREF=/tutors/aboutme.mpl?userid=hydromojo><B>hydromojo(20)</B></A><img src=\"/images/stars/stars-06.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=hydromojo><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=20707\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Lets say Walt puts $'X' @8%. the remaining would be $(9000-X)\r<BR>\n" );
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document.write( "Interest calculation = amount * (rate/100)0*time(in yrs in this case)\r<BR>\n" );
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document.write( "So, for the 8% investment<BR>\n" );
document.write( "Interest = X * (8/100) * 1 = $.08X ........#1\r<BR>\n" );
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document.write( "for the 9% investment<BR>\n" );
document.write( "Interest = (9000-X) * (9/100) * 1 = 810 - 0.09X ...........#2\r<BR>\n" );
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document.write( "The total interest is given as $770, so adding #1 & 2, we get\r<BR>\n" );
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document.write( ".08X + 810 - .09X = 770\r<BR>\n" );
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document.write( "solve this for X, and you get it to be $4000<BR>\n" );
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