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Determine whether or not the function is one-to-one.
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Marginal Tax Rate
The tax rate paid on the next dollar earned.
Average Tax Rate
Total amount of tax paid divided by total income.
Total Taxes
The aggregate amount of taxes collected by a government from individuals and businesses.
Taxable Income
The portion of an individual or entity's income that is subject to taxation, after deductions and exemptions, according to the law.
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