SOLUTION: a total of $8000 is invested. part at 7% and the remainder at 15%. how much is invested at each rate if theannual intrest is 680$?

SOLUTION: a total of $8000 is invested. part at 7% and the remainder at 15%. how much is invested at each rate if theannual intrest is 680$?

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Question 345340: a total of $8000 is invested. part at 7% and the remainder at 15%. how much is invested at each rate if theannual intrest is 680$?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let A be the amount invested at 7%, B the amount at 15%.
1.
2.
Multiply eq. 1 by (-7) and add to eq. 2,

Then from eq. 1,

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