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Which statement is least essential in defining a retrovirus?
Marginal Tax Rate
The tax rate that applies to the next additional increment of a taxpayer's taxable income.
Taxable Income
The portion of an individual's or a corporation's income that is subject to taxation by the government.
Marginal Tax Rate
The rate of tax applied to the last dollar of income or the next dollar of taxable income earned.
Chief Executive Officer
The highest-ranking executive in a company or organization, responsible for making major corporate decisions.
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