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In one month Holly earned $800 at her part-time job, and $50 was withheld for federal income tax. Suppose she earns $1200 next month. How much will be withheld for federal income tax? Round the answer to the nearest dollar.

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EmileN
In one month, Holly earned $800. From those $800, 50 dollars were withheld for federal income tax.
We suppose that next month, she earns $1200. Let x be the amount withheld for federal income tax, in dollars. We'll use the rule of three.

$800 ---> $50
$1200 ---> x

x = (1200*50) / 800
x = 60 000 / 800
x = 75

So next month, 75 dollars out of 1200 will be withheld for federal income tax.
Hope this helps! :)

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