I think I am not doing this problem right. I am also stuck on the last portion of it.

Conrad, who has $220,000 of taxable income plans to marry Anita, a college student with no taxable income. If they marry December 21, 2019, they will file jointly and have $220,000 of taxable income for the year. If they wait until January of 2020 to marry, Conrad will have to file as a single person and report the $220,000 of taxable income on his individual return.

A) Will it be to their advantage to marry before the end of 2019 or should they wait until 2020?

If they get married in 2020 and Conrad has to claim single, he will have a tax liability of $45,316.50 whereas if they filed married the tax liability will be $36,349. So, they should get married in 2019.

B) How much tax will they save or have to pay extra is they marry in 2019?

If they get married in 2020 the tax rate is 32% whereas if they get married in 2019 the tax rate will be 24%.

C) How would your answers change if Conrad and Anita marry and each expects $110,000 of taxable income in 2019?