document.write( "Question 663056: Susan invests 2 times as much money at 5% as she does at 4%. If her total interest after 1 year is $840, how much does she have invested at each rate? \n" ); document.write( "
Algebra.Com's Answer #412601 by ReadingBoosters(3246)\"\" \"About 
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x = $ at 5%
\n" ); document.write( "y = $ at 4%
\n" ); document.write( "y = 2x
\n" ); document.write( ".05x + .04y = 840
\n" ); document.write( ".05x + .04(2x) = 840
\n" ); document.write( ".05x + .08x = 840
\n" ); document.write( ".13x = 840
\n" ); document.write( "x = $6,461.54 at 5%
\n" ); document.write( "y = 2(6461.54) = $12,923.08 at 4%
\n" ); document.write( "Proof
\n" ); document.write( ".05(6461.54) + .04(12923.08) =
\n" ); document.write( "323.08 + 516.92 = 840
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