SOLUTION: Mrs Jones invests $4000 at 10% annual return and $6000 at 12% annual return. How much should she invest at 15% return so that her total annual return is 13% of the total amount she

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Question 206940: Mrs Jones invests $4000 at 10% annual return and $6000 at 12% annual return. How much should she invest at 15% return so that her total annual return is 13% of the total amount she has invested?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Mrs Jones invests $4000 at 10% annual return and $6000 at 12% annual return. How much should she invest at 15% return so that her total annual return is 13% of the total amount she has invested?
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Interest Equation: 0.10(4000)+ 0.12(6000) + 0.15x = 0.13(10,000+x)
Multiply thru by 100 to get:
40000 + 72000 + 15x = 130000+ 13x
2x = 18000
x = $9000
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Cheers,
Stan H.