SOLUTION: Not understanding how to put this question in an algebraic expression! Mike made $9,000 last year from an extra job. He invested part of the money at a 9% annual rate of interest a

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Question 295751: Not understanding how to put this question in an algebraic expression! Mike made $9,000 last year from an extra job. He invested part of the money at a 9% annual rate of interest and the rest of it at 8%. At the end of the year, he made a total of $770 in interest. How much was invested at the 8%?
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Let represent the amount invested at 8%. Then, since the rest of his money was invested at 9%, the amount invested at 9% was

The amount of money he earned on the 8% investment was then , and the amount of money he earned on the 9% investment was .

Since the total amount that he earned was $770, you can say:



Now just solve for .

John