Assume that in a given country, tax revenues, T, depend on income, I, according to the formula

T = -4000+ 0.2I

You are to fill the given table given the level of income.

Income Tax Liability Average Tax Rate Marginal Tax Rate

$2,000

3,000

5,000

10,000

30,000

please note i am looking for the answers of tax liability, average tax rate and marginal tax rate with the given income.