SOLUTION: Alicia has $7000 invested; some at 7% and the remainder at 8%. After one year, the interest from the 7% investment exceeds the interest from the 8% investment by $70. How much is i

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Question 314255: Alicia has $7000 invested; some at 7% and the remainder at 8%. After one year, the interest from the 7% investment exceeds the interest from the 8% investment by $70. How much is invested at each rate.
Thanks in advance for any assistance!
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.08x+70=.07(7,000-x)
.08x+70=490-.07x
.08x+.07x=490-70
.15x=420
x=420/.15
x=2,800 amount invested @ 8%.
7,000-2,800=4,200 amount invested @ 7%.
Proof:
.08*2,800+70=.07*4,200
224+70=294
294=294