Question 179787
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Let <i>x</i> be the amount invested at 8.5%.  Then the amount invested at 8.0% must be $50,000 - <i>x</i>.


The amount of interest on the 8.5% investment must then be *[tex \Large 0.085x] and the amount of interest on the 8.0% investment must be *[tex \Large 0.08(50000 - x)].  The sum of these two amounts is the total interest, so:


*[tex \Large 0.085x + 0.08(50000 - x) = 4120]


Solve for x to get one of the investment amounts.  Subtract that amount from 4120 to get the other amount.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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