Mr. and Mrs. Black have the following tax information for 2021 and file a joint return [ Note : do Not consider AMT when preparing the solution problem ] :

Salary - Mr Black	$ 70,000
Salary - Mrs Black	$ 80,000
Gross receipts from Mr. Black's consulting business	$ 210,000
Expenses related to Mr Black's consulting business	$ 118,000
Interest from City of Smithville bonds	$ 10,000
Itemized deductions : Mortgage interest Real property taxes	$ 22,000 $ 13,000
QBID	$ 18,400
Withholdings of income tax	$ 18,000
Timely made payments of estimated tax (total)	$ 16,000

a. Compute their Adjusted Gross Income

b. Assume AGI is $245,000. Compute their taxable income

c. Assume total tax liability is $43,000. What is the net tax due or tax refund ?