Which of the following compounds is (s) -n-methyl-2-butanamine? 
Definitions:
Marginal Tax Rate
The rate at which the last dollar of income is taxed, indicating the impact of an additional dollar of income on the amount of taxes owed.
Taxable Income
The amount of income that is subject to taxes, after all deductions and exemptions have been factored in.
After-Tax Income
The amount of income left after all taxes have been deducted.
Progressive Tax
A tax system where the tax rate increases as the taxable amount increases, typically applied to income tax to ensure those with higher earnings pay a higher rate of tax relative to their income.
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