SOLUTION: walt made an extra $9000.00 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 $780.00 in interest. how much was invested a

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Question 96019: walt made an extra $9000.00 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 $780.00 in interest. how much was invested at 7%
Answer by elima(1433) About Me  (Show Source):
You can put this solution on YOUR website!
x = amount invested at 10%
9000 - x = amount invested at 7%
.10x + .07(9000-x) = 780
.10x + 630 - .07x = 780
.03x + 630 = 780
.03x = 150
x = 5000
9000 - 5000 = 4000
so $5000 was invested at 10%
$4000 was invested at 7%
:)