SOLUTION: Susan invests 2 times as much money at 12% as she does at 9%. If her total interest after 1 year is $1320, how much does she have invested at each rate? Susan invests $ ( )

Question 1095261: Susan invests 2 times as much money at 12% as she does at 9%. If her total interest after
1 year is $1320, how much does she have invested at each rate?
Susan invests $ ( ) at 9% and $ ( ) at 12%.
Found 2 solutions by addingup, josmiceli:
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
0.09x + 0.12(2x) = 1320
0.09x + 0.24x = 1320
0.33x = 1320
x = 4000 this is the amount invested at 9%
2x = 2(4000) = 8000 this is the amount invested at 12%
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Assuming simple interest:

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given:

and

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She invests $4,000 @ 9%
She invests $8,000 @ 12%
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check:

and

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OK
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