document.write( "Question 403805: Betsy, a recent retiree, requires $6,000 per year in extra income. She has $60,000 to invest and can invest in B-rated bonds paying 15% per year or in a certificate of deposit (CD) paying 5% per year. How much money should be invested in each to realize exactly $6,000 in interest per year? \n" ); document.write( "
Algebra.Com's Answer #285507 by ankor@dixie-net.com(22740)\"\" \"About 
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requires $6,000 per year in extra income.
\n" ); document.write( "She has $60,000 to invest and can invest in B-rated bonds paying 15% per year
\n" ); document.write( " or in a certificate of deposit (CD) paying 5% per year.
\n" ); document.write( " How much money should be invested in each to realize exactly $6,000 in interest per year?
\n" ); document.write( ":
\n" ); document.write( "Let b = amt to be invested in bonds
\n" ); document.write( "Let c = amt in CD's
\n" ); document.write( ":
\n" ); document.write( "b + c = 60000
\n" ); document.write( "c = (60000-b)
\n" ); document.write( ":
\n" ); document.write( ".15b + .05c = 6000
\n" ); document.write( "replace c with (60000-b)
\n" ); document.write( ".15b + .05(60000-b) = 6000
\n" ); document.write( ".15b + 3000 - .05b = 6000
\n" ); document.write( ".15b - .05b = 6000 - 3000
\n" ); document.write( ".10b = 3000
\n" ); document.write( "b = \"3000%2F.10\"
\n" ); document.write( "b = $30,000 invested in bonds
\n" ); document.write( "and
\n" ); document.write( "c = 60000 - 30000
\n" ); document.write( "c = $30,000 invested in CD's
\n" ); document.write( ":
\n" ); document.write( ";
\n" ); document.write( "See if that checks out
\n" ); document.write( ".15(30000) = 4500
\n" ); document.write( ".05(30000) = 1500
\n" ); document.write( "------------------
\n" ); document.write( "total amt: 6000
\n" ); document.write( "
\n" );