Algebra 2
posted by Trisan .
Sam invested $7000, part at 7% and the rest at 11%. If his total return for one year was $690, how much was invested at each rate?

X * 0.07 + (7000X) * 0.11 = 690
0.07X + 770  0.11X = 690
0.04X = 80
X = 2000 @ 7%
5000 @ 11%