document.write( "Question 86257: The Knox Valley investment club invested $8000 at 4.6% annual simple interest. How much additional money should they invest at an annual simple interest rate of 3.6%, so that the total annual interest earned from the two accounts is 4.0% of the total investment?
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Algebra.Com's Answer #62378 by stanbon(75887)\"\" \"About 
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The Knox Valley investment club invested $8000 at 4.6% annual simple interest. How much additional money should they invest at an annual simple interest rate of 3.6%, so that the total annual interest earned from the two accounts is 4.0% of the total investment?
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\n" ); document.write( "Amt.invested at 4.6% = 8000; interest on that is 0.046(8000) = 368 dollars
\n" ); document.write( "Amt.invested at 3.6% = x ; interest on that is 0.036x dollars
\n" ); document.write( "Amt. invested at 4% = 8000+x; interest on that is 0.04(8000+x) = 320+0.04x dollars
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\n" ); document.write( "EQUATIOn:
\n" ); document.write( "interest + interest = interest
\n" ); document.write( "368 + 0.036x = 0.040(8000+x)
\n" ); document.write( "368 + 0.036x = 320+0.040x
\n" ); document.write( "0.004x = 48
\n" ); document.write( "x = 12000 dollars (amt. of addtional money invested at 3.6%)
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\n" ); document.write( "Cheers,
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