document.write( "Question 810824: A total of $16,000 is invested in 3 accounts earning 4%, 6%, and 8% annual interest. The combined interest for one year is $934. If the amount invested at 8% is three times the amount at 6%, find the amount invested at 4%. \n" ); document.write( "
Algebra.Com's Answer #488514 by mananth(16946)\"\" \"About 
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investment @ 6%----------x
\n" ); document.write( "investment at 8%---------3x\r
\n" ); document.write( "\n" ); document.write( "investment @%4 ----------16000-(3x+x)=16000-4x\r
\n" ); document.write( "\n" ); document.write( "6%x+8%3x+4%(16000-4x)=934\r
\n" ); document.write( "\n" ); document.write( "multiply equation by 100\r
\n" ); document.write( "\n" ); document.write( "6x+8*3x+4(16000-4x)=93400\r
\n" ); document.write( "\n" ); document.write( "6x+24x+64000-16x=93400\r
\n" ); document.write( "\n" ); document.write( "14x=93400-64000\r
\n" ); document.write( "\n" ); document.write( "14x=429400
\n" ); document.write( "x=29400/14
\n" ); document.write( "x=2100 \r
\n" ); document.write( "\n" ); document.write( "Investment 4% = 16000-4x
\n" ); document.write( "=16000-4*2100
\n" ); document.write( "=16000-8400
\n" ); document.write( "=7600
\n" ); document.write( "
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