SOLUTION: In one month Karina earned $600 at her part-time job, and $90 was withheld for federal income tax. Suppose she earns $900 next month. How much will be withheld for federal income t

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Question 1061396: In one month Karina earned $600 at her part-time job, and $90 was withheld for federal income tax. Suppose she earns $900 next month. How much will be withheld for federal income tax?
Found 2 solutions by rfer, MathTherapy:
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
90/600=x/900
600x=900*90
x=81000/600
x=$135

Answer by MathTherapy(10555) About Me  (Show Source):
You can put this solution on YOUR website!

In one month Karina earned $600 at her part-time job, and $90 was withheld for federal income tax. Suppose she earns $900 next month. How much will be withheld for federal income tax?
With F being the federal withholdings on $900, we get the following PROPORTION: 600%2F900+=+90%2FF

2%2F3+=+90%2FF -------- Reducing 600%2F900

2F = 3(90) ------ Cross-multiplying

F, or federal withholdings on $900 = highlight_green%28matrix%281%2C3%2C+3%2890%29%2F2%2C+or%2C+%22%24135%22%29%29