Ms. Busch has gathered these data about her finances:

Salary 140,000

Taxable interest received 2,500

Municipal bond interest received 15,000

Total itemized deductions 8,000

The personal exemption is $3,700. The standard deduction for a single filer is $5,800.

a. Her tax

b. Her average effective tax rate

c. Her average tax rate

d. Her marginal tax rate

e. Her accountant discovers a previously omitted personal deduction of $800. By how much does her federal tax liability fall with that addition?

f. Amazingly enough, the accountant now discovers a $250 credit omitted from previous calculations (but after discovering the $800 in part e.). By how much does her federal tax liability fall because of this credit?