SOLUTION: Mike made an extra $8000 last year from a part time job. He invested part of the money at 10% and the rest at 7%. He made a total of $710 in interest. How much was invested at 7%?

Question 324112: Mike made an extra $8000 last year from a part time job. He invested part of the money at 10% and the rest at 7%. He made a total of $710 in interest. How much was invested at 7%?
Answer by galactus(183) (Show Source): You can put this solution on YOUR website!
Let x=amount invested at 7%. Then, the amount invested at 10% would be 8000-x.
So, we have

invested at 7%, there is 5000 invested at 10%.
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