Suppose taxes are related to income level as follows: Income Tax $1,000 $200 $2,000 $350 $3,000 $450

Question:

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