SOLUTION: 3. Walt made an extra $12,000 last year from a part-time job. He invested part of the money at 7% and the rest at 9%. He made a total of $970 in interest. How much was invested at

Question 180998: 3. Walt made an extra $12,000 last year from a part-time job. He invested part of the money at 7% and the rest at 9%. He made a total of $970 in interest. How much was invested at 7%?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = amount invested @ 7%
Let = amount invested @ 9%
given:
(1)
(2)
Multiply both sides of (2) by
and subtract from (1)
(1)
(2)
And, subtracting:
(1)
(2)

And, since
(2)

$5500 was invested @ 7%
check:
(1)

OK
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