document.write( "Question 321159: If Ben invests $4000 at 4% interest per year, how much additional money must he invest at 5.5% annual interest to ensure that the interest he receives each year is 4.5% of the total amount invested? \n" ); document.write( "
Algebra.Com's Answer #229994 by mananth(16946)\"\" \"About 
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If Ben invests $4000 at 4% interest per year, how much additional money must he invest at 5.5% annual interest to ensure that the interest he receives each year is 4.5% of the total amount invested?
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\n" ); document.write( "let the additional amount to be invested be $x at 5.5%
\n" ); document.write( "$4000 at 4%
\n" ); document.write( "Total invested will be 4000+x , interest 4.5%
\n" ); document.write( "..
\n" ); document.write( "Interest at 4% +interest at5.5% = iinterest at4.5%
\n" ); document.write( "0.04*4000+0.055x=0.045(4000+x)
\n" ); document.write( "160+0.055x=180+0.045x
\n" ); document.write( "0.055x-0.045x=180-160
\n" ); document.write( "0.010x=20
\n" ); document.write( "x= 20/0.010
\n" ); document.write( "$ 2000 must be invested at 5.5%
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