The amount deposited at each rate if the annual interest income in $2160 such as $36000 was deposited at 2.5% and $18000 was deposited at 4.5%.
Resultant deposited amount = Deposited amount - The amount deducted.
Let us assume $x is a deposit at 3% interest.
At the rate of 4.5% deposited amount is twice the amount deposited at 2.5%.
Therefore, at the rate 4.5% deposited amount = $2x.
In planning her retirement, Liza deposits some money at 3% interest, with twice as much deposited at 4.5%.
0.03x + 0.045(2x) = $2160
0.12x = $2160
x = $18,000 at 3%
2x = $36,000 at 4.5%
Therefore,
$36000 was deposited at 2.5% and $18000 was deposited at 4.5%.
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