document.write( "Question 95643: Susan purchased municipal bonds which yield 7% annually and certificates of deposit which yield 8% annually. If Susan's initial investment amounts to $18,000 and the annual income is $1380, how much money is invested in bonds and how much is invested in certificates of deposit? \n" ); document.write( "
Algebra.Com's Answer #69699 by checkley71(8403)\"\" \"About 
You can put this solution on YOUR website!
.08*X+.07(18000-X)=1380
\n" ); document.write( ".08X+1260-.07X=1380
\n" ); document.write( ".01X=1380-1260
\n" ); document.write( ".01X=120
\n" ); document.write( "X=120/.01
\n" ); document.write( "X=12000 INVESTED IN CERTIFICATES.
\n" ); document.write( "18000-12000=6000 INMVESTED IN BONDS.
\n" ); document.write( "PROOF
\n" ); document.write( "12000*.08+6000*.07=1380
\n" ); document.write( "960+420=1380
\n" ); document.write( "1380=1380
\n" ); document.write( "
\n" );