SOLUTION: Jolene invests her savings in two bank accounts, one paying 4 percent and the other paying 8 percent simple interest per year. She puts twice as much in the lower-yielding account

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Question 1149476: Jolene invests her savings in two bank accounts, one paying 4 percent and the other paying 8 percent simple interest per year. She puts twice as much in the lower-yielding account because it is less risky. Her annual interest is 7840 dollars. How much did she invest at each rate?
Answer by ikleyn(52749) About Me  (Show Source):
You can put this solution on YOUR website!
.

    0.04*(2x) + 0.08*x = 7840.


Solve for x, which is the investment at 8%.


Then calculate 2x, which is the amount invested at 4%.