document.write( "Question 907460: If $7,000.00 is invested in a bank that pays 5% interest, how much more must be invested in bonds at 9% to earn 7% on the total investment?\r
\n" ); document.write( "\n" ); document.write( "To earn 7% on the total investment, $______ more must be invested in bonds at 9%. \n" ); document.write( "
Algebra.Com's Answer #550432 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
one investment all 3 rates
\n" ); document.write( "0.05*7000+0.09(x)=0.07(7000+x)
\n" ); document.write( "Multiply out.
\n" ); document.write( "350+0.09(x)=490+0.07x
\n" ); document.write( "combine like terms
\n" ); document.write( "0.02x=140
\n" ); document.write( "isolate x
\n" ); document.write( "x=140/0.02
\n" ); document.write( "Divide
\n" ); document.write( "x=7000
\n" ); document.write( "check
\n" ); document.write( "0.05*7000+0.09(x)=0.07(7000+x)
\n" ); document.write( "350+0.09*7000=0.07(7000+7000)
\n" ); document.write( "350+630=0.07(14000)
\n" ); document.write( "980=980
\n" ); document.write( "ok\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );