SOLUTION: If $80,000 is invested part at 8% and the rest at 10%, and the interest from one year is $7,800, how much was invested at 10%?

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Question 968188: If $80,000 is invested part at 8% and the rest at 10%, and the interest from one year is $7,800, how much was invested at 10%?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
If $80,000 is invested part at 8% and the rest at 10%, and the interest from one year is $7,800, how much was invested at 10%?
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Equation:
int + int = interest
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0.10x + 0.08(80,000-x) = 7800
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10x + 8*80000 - 8x = 780000
2x = 780000-640000
2x = 120000
x = $60,000 (amt. invested at 10%)
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Cheers,
Stan H.
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