Math
posted by Maerika .
An executive invests $24,000, some at 7% and some at 5% annual interest. If he receives an annual return of $1600, how much is invested at each rate?

Let amount invested at 7% be $x.
Amount invested at 5% = $(24000x)
x*0.07+(24000x)*0.05 = 1600
Solve for x.
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