SOLUTION: Walt made an extra $9000 last year from a part-time job. He invested part of the money at a 9% annual rate of interest, and the rest at an 8% annual rate of interest. At the end of

SOLUTION: Walt made an extra $9000 last year from a part-time job. He invested part of the money at a 9% annual rate of interest, and the rest at an 8% annual rate of interest. At the end of

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Question 34376: Walt made an extra $9000 last year from a part-time job. He invested part of the money at a 9% annual rate of interest, and the rest at an 8% annual rate of interest. At the end of the year, he made a total of $770 in interest. How much was invested at 8%?
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
(9000-x).08+.09x=770 or 720-.08x+.09x=770 or .01x=50 or x=5000 thus the amount invested @ 8% is 9000-5000 or 4000
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