document.write( "Question 148933: Walt made an extra $9000 last year from a part-time job. he invested part of the money at 9% and the rest at 8%. he made a total of $770 in interest. How much was invested at 8%? \n" ); document.write( "
Algebra.Com's Answer #109263 by checkley77(12844)![]() ![]() ![]() You can put this solution on YOUR website! .09X+.08(9000-X)=770 \n" ); document.write( ".09X+720-.08X=770 \n" ); document.write( ".01X=770-720 \n" ); document.write( ".01X=50 \n" ); document.write( "X=50/.01 \n" ); document.write( "X=5,000 INVESTED @ 9% \n" ); document.write( "9,000-5,000=4,000 INVESTED @ 8%. \n" ); document.write( "PROOF: \n" ); document.write( ".09*5000+.08*4000=770 \n" ); document.write( "450+320=770 \n" ); document.write( "770=770 \n" ); document.write( " |