(Tax Rates) Suppose taxes are related to income as follows:
Income Taxes
$1,000 $200
$2,000 $350
$3,000 $450
What percentage of income is paid in taxes at each level? Is the tax rate progressive, proportional, or regressive? What is the marginal tax rate on the first $1,000 of income? The second $1,000? The third $1,000? Explain.