document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1163730>Question 1163730</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Equal amounts are invested at 5%,7%, and 9% annual interest. If the three investments yield a total of $840 annual interest , find the total investment.  </SPAN>\n" );
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document.write( "Equal amounts invested at 5%, 7%, and 9% means the average rate is 7%, because 7% is halfway between 5% and 9%.<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=.07%28x%29+=+840 ALIGN=MIDDLE  ALT=\".07%28x%29+=+840\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+840%2F.07+=+12000 ALIGN=MIDDLE  ALT=\"x+=+840%2F.07+=+12000\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "ANSWER: The amount invested was $12,000.<br><BR>\n" );
document.write( "CHECK: .05(4000)+.07(4000)+.09(4000) = 200+280+360 = 840<br><BR>\n" );
document.write( " </SPAN>\n" );
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