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2 answers:
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Answer:
The amount invested at 4% per year was $3,000
The amount invested at 4.5% per year was $6,000
The amount invested at 2.5% per year was $1,000
Step-by-step explanation:
Let
x -----> the amount invested at 4% per year
2x ----> the amount invested at 4.5% per year
10,000-3x -----> the amount invested at 2.5% per year
we know that
The interest earned by the amount invested at 4% per year plus the interest earned by the amount invested at 4.5% per year plus the interest earned by the amount invested at 2.5% per year must be equal to $415
so
Solve for x
therefore
The amount invested at 4% per year was $3,000
The amount invested at 4.5% per year was $6,000
The amount invested at 2.5% per year was $1,000