Final answer:
The tax described in the question is progressive.
Step-by-step explanation:
The tax described in the question is progressive.
A progressive tax is one where the tax rate increases as the income increases. In this case, the tax rate increases from $100 on an income of $1,000, to $250 on an income of $2,000, and finally to $600 on an income of $3,000.
As we can see, the tax burden increases along with the increase in income, making it a progressive tax.