document.write( "Question 816750: Phyllis invested $12,000, a portion earning a simple interest rate of 4.5% per year and the rest earning a rate of 4% per year. After 1 year the total interest earned on these investments was $525. How much did she invest at each rate?\r
\n" ); document.write( "\n" ); document.write( "I am constantly getting this answer wrong. The book is saying 30, but when I follow the equation
\n" ); document.write( "0.04x +0.045(12000-x)=525\r
\n" ); document.write( "\n" ); document.write( "my answer is way off. Maybe I'm working out the wrong equation. \n" ); document.write( "

Algebra.Com's Answer #491696 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "Investing $12,000, some at 4% and some at 4.5%
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document.write( "0.04x +0.045(12000-x)= $525
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document.write( " 0.04x + 540 -.045x = 525 
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document.write( "    540-525 = .005x
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document.write( "      15/.005 = x = $3000 at 4%  and $9000 at 4.5%
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document.write( "CHECKING our answer***
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document.write( "  = $120 + $405 = $525 \n" );
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