SOLUTION: A woman invested $15,000, part at 7% simple annual interest and part at 8% annual interest. If she receives $1,180 interest per year, how much did she invest at 7%?

Question 1128417: A woman invested $15,000, part at 7% simple annual interest and part at 8% annual interest. If she receives $1,180 interest per year, how much did she invest at 7%?
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
part at 0.07: x
part at 0.08: 15,000 - x
0.07x + 0.08(15000 - x) = 1,180
now just do the math. First distribute the 0.08:
0.07x + 1,200 - 0.08x = 1,180
-0.01x = -20 divide, and remember that -/- = +
x = 2,000
:
the woman invested 2,000 at 7%
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