If your income is $50,000, your income tax liability is $10,000, and you paid $0.25 in taxes on the last dollar you earned, your

a)marginal tax rate is 20 percent.

b)average tax rate is 5 percent.

c)marginal tax rate is 25 percent.

d)average tax rate is 25 percent.

e)total tax rate is 25 percent.

f)All of the above.

g)None of the above.

Which of the following is most crucial in determining behavior changes that can cause losses in efficiency?

a.The marginal tax rate.

b.The average tax rate.

c.The degree of progressivity.

d.The number of tax brackets.

e.All of the above.

f.None of the above.