SOLUTION: Lisa invested $8000, part at 4% and the rest at 5% per year. How much did she invest at each rate if her total return per year on the investments was $380?

Question 476003: Lisa invested $8000, part at 4% and the rest at 5% per year. How much did she invest at each rate if her total return per year on the investments was $380?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = amount invested @ 4% per yr
Let = amount invested @ 5% per yr
given:
(1)
(2)
----------------------
(2)
Multiply both sides of (1) by and subtract from (2)
(2)
(1)

and
(1)
(1)
(1)
$2,000 is invested @ 4% per yr
$6,000 is invested @ 5% per yr
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