SOLUTION: Erica earned $12,000 last year. He invested part of her money at 3% and the rest at 4% single interest. In one year she earned $440.00 in interest. How much did she invest at each

Question 439570: Erica earned $12,000 last year. He invested part of her money at 3% and the rest at 4% single interest. In one year she earned $440.00 in interest. How much did she invest at each rate
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = amount invested @ 3% interest
Let = amount invested @ 4% interest
given:
(1)
(2)
-------------------
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)

$4,000 = amount invested @ 3% interest
$8,000 = amount invested @ 4% interest
check answer:
(2)
(2)

OK
RELATED QUESTIONS
Walt made an extra $10,000 last year from a part-time job. He invested part of the money... (answered by ikleyn,greenestamps)

Jane has $10 000 to invest. She invested part of it in a term deposit that pays 4% per... (answered by checkley71)

carter fenton earned $12,000 last year by giving tennis lessons. He invested part of the... (answered by mananth)

George earned $12,000 last year by giving tennis lessons. He invested part at 3% simple... (answered by checkley77)

sheryl won $60000 on slot machine in oxford. She invested part of the money at 2% and the (answered by Marz157,MathTherapy)

Brandon invested $20 000. He invested part of the money in a term deposit paying 4%... (answered by ikleyn,greenestamps)

# 9. Mike invested $7000 for one year. He invested part of it at 8% and the rest at 12%. (answered by jim_thompson5910)

Mike invested $7000 for one year. He invested part of it at 8% and the rest at 12%. At... (answered by checkley75)

John invested $7000 for one year. He invested part of it at 8% and the rest at 12%. At... (answered by Mathtut)