document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1102815>Question 1102815</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Susan invests <BR>\n" );
document.write( "3 times as much money at \r<BR>\n" );
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document.write( "11% as she does at \r<BR>\n" );
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document.write( "7%. If her total interest after <BR>\n" );
document.write( "1 year is \r<BR>\n" );
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document.write( "$2400, how much does she have invested at each rate? </SPAN>\n" );
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document.write( "Let x be the amount invested at 7%; then the amount invested at 11% is 3x.<br><BR>\n" );
document.write( "The interest from the first investment is then .07 times x; the interest from the second is .11 times 3x.<br><BR>\n" );
document.write( "Since the total interest is $2400,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.07%28x%29%2B.11%283x%29+=+2400 ALIGN=MIDDLE  ALT=\".07%28x%29%2B.11%283x%29+=+2400\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.07x%2B.33x+=+2400 ALIGN=MIDDLE  ALT=\".07x%2B.33x+=+2400\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.40x+=+2400 ALIGN=MIDDLE  ALT=\".40x+=+2400\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+2400%2F.40+=+6000 ALIGN=MIDDLE  ALT=\"x+=+2400%2F.40+=+6000\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "She invested x = $6000 at 7% and 3x = $18000 at 11%.<br><BR>\n" );
document.write( "CHECK:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.07%286000%29%2B.11%2818000%29+=+420%2B1980+=+2400 ALIGN=MIDDLE  ALT=\".07%286000%29%2B.11%2818000%29+=+420%2B1980+=+2400\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );