SOLUTION: 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%?

Question 153326: 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%?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
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%?
:
Let x = amt invested at 8%
Then
(9000-x) = amt invested at 9%
:
Write an interest equation:
:
.08x + .09(9000-x) = 770
:
.08x + 810 - .09x = 770
:
.08x - .09x = 770 - 810
:
-.01x = -40
x =
x = +$4000 invested at 8%
:
:
Check solution:
.08(4000) + .09(5000) =
320 + 450 = 770

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