document.write( "Question 647186: You invested $18,000 in two accounts paying 5% and 7% annual interest, respectively. If the total interest earned for the year was $1020, how much was invested at each rate? Whats the amount invested at 5%? \n" ); document.write( "
Algebra.Com's Answer #406027 by stanbon(75887)\"\" \"About 
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You invested $18,000 in two accounts paying 5% and 7% annual interest, respectively. If the total interest earned for the year was $1020, how much was invested at each rate? Whats the amount invested at 5%?
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\n" ); document.write( "Equation:
\n" ); document.write( "Quantity Eq: f + s = 18000
\n" ); document.write( "Interest Eq:5f +7s = 102000
\n" ); document.write( "----
\n" ); document.write( "Modify the 1st equation:
\n" ); document.write( "5f + 5s = 5*18000
\n" ); document.write( "5f + 7s = 102000
\n" ); document.write( "------------------------
\n" ); document.write( "Subtract and solve for \"s\":
\n" ); document.write( "2s = 12000
\n" ); document.write( "s = $6000 (amt. invested at 7%)
\n" ); document.write( "---
\n" ); document.write( "Solve for \"f\":
\n" ); document.write( "f + s = 18000
\n" ); document.write( "f + 6000 = 18000
\n" ); document.write( "f = $12000 (amt. invested at 5%)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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