Algebra 2 trig , Interest question?

MikiaD

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In planning her retirement, Callie Daniels deposited money at 2.5% interest with twice as much deposited at 3% . Find the amount invested at each rate if the total annual income is 3600$.


The answer is:
10,000 at 2.5% and 20,000 at 3%
can someone please thoroughly explain how they got there answer. I need help on this.
 
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