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jake jenkins earned 9000 last year by giving tennis lessons. he invested part at 7% simple interest and the rest at 4%. he earned a total of 540 in interest. how much did he invest at 4%

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x+ y = 9000
.07x + .04y =540

x = amt at 7% and y= amt at 4%

x + y = 9000
7x+4y = 54000

-7x -7y =-63000

-3y = -9000
y=3000

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