document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1092177>Question 1092177</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Katie invested a total of $4000, part at 3% simple interest and part at 4% simple interest. At the end of 1 year, the investments had earned $136 interest. How much was invested at each rate? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #706740 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=706740\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I+=+P%2Ar%2At+ ALIGN=MIDDLE  ALT=\"+I+=+P%2Ar%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B1%5D+=+P%5B1%5D%2A.03%2A1+ ALIGN=MIDDLE  ALT=\"+I%5B1%5D+=+P%5B1%5D%2A.03%2A1+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B1%5D+=+.03P%5B1%5D+ ALIGN=MIDDLE  ALT=\"+I%5B1%5D+=+.03P%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------------------<BR>\n" );
document.write( "and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B2%5D+=+.04P%5B2%5D+ ALIGN=MIDDLE  ALT=\"+I%5B2%5D+=+.04P%5B2%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+P%5B2%5D+=+4000+-+P%5B1%5D+ ALIGN=MIDDLE  ALT=\"+P%5B2%5D+=+4000+-+P%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B2%5D+=+.04%2A%28+4000+-+P%5B1%5D+%29+ ALIGN=MIDDLE  ALT=\"+I%5B2%5D+=+.04%2A%28+4000+-+P%5B1%5D+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B2%5D+=+136+-+I%5B1%5D+ ALIGN=MIDDLE  ALT=\"+I%5B2%5D+=+136+-+I%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+136+-+I%5B1%5D+=+.04%2A%28+4000+-+P%5B1%5D+%29+ ALIGN=MIDDLE  ALT=\"+136+-+I%5B1%5D+=+.04%2A%28+4000+-+P%5B1%5D+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "----------------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+136+-+I%5B1%5D+=+160+-+.04P%5B1%5D+ ALIGN=MIDDLE  ALT=\"+136+-+I%5B1%5D+=+160+-+.04P%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B1%5D+=+.04P%5B1%5D+-+24+ ALIGN=MIDDLE  ALT=\"+I%5B1%5D+=+.04P%5B1%5D+-+24+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Plug (1) into (2)<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.03P%5B1%5D+=+.04P%5B1%5D+-+24+ ALIGN=MIDDLE  ALT=\"+.03P%5B1%5D+=+.04P%5B1%5D+-+24+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.01P%5B1%5D+=+24+ ALIGN=MIDDLE  ALT=\"+.01P%5B1%5D+=+24+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+P%5B1%5D+=+2400+ ALIGN=MIDDLE  ALT=\"+P%5B1%5D+=+2400+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+P%5B2%5D+=+4000+-+P%5B1%5D+ ALIGN=MIDDLE  ALT=\"+P%5B2%5D+=+4000+-+P%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+P%5B2%5D+=+4000+-+2400+ ALIGN=MIDDLE  ALT=\"+P%5B2%5D+=+4000+-+2400+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+P%5B2%5D+=+1600+ ALIGN=MIDDLE  ALT=\"+P%5B2%5D+=+1600+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "$2,400 is invested @ 3%<BR>\n" );
document.write( "$1,600 is invested @ 4%<BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B1%5D+=+.03P%5B1%5D+ ALIGN=MIDDLE  ALT=\"+I%5B1%5D+=+.03P%5B1%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B1%5D+=+.03%2A2400+ ALIGN=MIDDLE  ALT=\"+I%5B1%5D+=+.03%2A2400+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B1%5D+=+72+ ALIGN=MIDDLE  ALT=\"+I%5B1%5D+=+72+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B2%5D+=+.04%2AP%5B2%5D+ ALIGN=MIDDLE  ALT=\"+I%5B2%5D+=+.04%2AP%5B2%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B2%5D+=+.04%2A1600+ ALIGN=MIDDLE  ALT=\"+I%5B2%5D+=+.04%2A1600+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B2%5D+=+64+ ALIGN=MIDDLE  ALT=\"+I%5B2%5D+=+64+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B1%5D+%2B+I%5B2%5D+=+72+%2B+64+ ALIGN=MIDDLE  ALT=\"+I%5B1%5D+%2B+I%5B2%5D+=+72+%2B+64+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+I%5B1%5D+%2B+I%5B2%5D+=+136+ ALIGN=MIDDLE  ALT=\"+I%5B1%5D+%2B+I%5B2%5D+=+136+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK<BR>\n" );
document.write( " \r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );