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Solve the system of linear equations using the Gauss-Jordan elimination method.
Income Groups
Categories of people classified according to the level of their income, often used in socio-economic and market research to analyze spending habits, needs, and trends.
Lump-Sum
A single payment made at a particular time, as opposed to a series of smaller payments or installments.
Tax System
The structured way in which taxes are levied in a country, including the collection, management, and expenditure of taxed income.
Regressive
Describes a tax structure where the tax rate decreases as the taxable amount increases, placing a higher relative burden on lower income earners.
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