SOLUTION: Doris invested some money at 7% and some at 8%. She invested $6000 more at 8% then at 7%. Her total yearly interest from both investments was $1080, how much did she invest at each

Question 236200: Doris invested some money at 7% and some at 8%. She invested $6000 more at 8% then at 7%. Her total yearly interest from both investments was $1080, how much did she invest at each rate?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
.08(x+6,000)+.07x=1,080
.08x+480+.07x=1,080
.15x=1,080-480
.15x=600
x=600/.15
x=4,000 amount invested @ 7%.
4,000+6,000=10,000 invested @ 8%.
Proof:
.08*10,000+.07*4,000=1,080
800+280=1,080
1,080=1,080
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