A tax of $10 on an income of $100,$25 on an income of $200,and $60 on an income of $300 is:

A) progressive.
B) proportional.
C) regressive.
D) flat.

Progressive

A political and social philosophy advocating for reforms and changes that aim towards greater equality and the improvement of public welfare.

Regressive

A tax system in which the tax rate decreases as the taxable amount increases, placing a higher burden on lower-income earners.

Proportional

Relating to or having characteristics that maintain a consistent relationship in size, amount, or degree with something else, often used in mathematics and statistics.