Lisa holds 2014 nonrefundable tax credits of $65,000. Her regular income tax liability before credits is $190,000,

Question:

Lisa holds 2014 nonrefundable tax credits of $65,000. Her regular income tax liability before credits is $190,000, and her tentative minimum tax is $150,000.
a. What is the amount of Lisa's AMT?
b. What is the amount of Lisa's regular income tax liability after credits?