a total of eight thousand dollars is invested for one year part at nine percent and the remainder at 8% if $665 interest is earned how much is invested at 8 percent?

x+ y = 8000

.09x+.08y = 665

.08x+.08y = 640

.01x = 25

x =2500

y = 5500

25*9+55*8 = 225+440 =665

9% investment = $2500

8% investment = $5500

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