Chapter 16, D.1 Taxpayer has a gas card he uses for all the gas purchased for his personal car. During the year he paid $500 in interest for gas charged on the card. Can he deduct this interest?

Chapter 16, D.3 In 2018 Taxpayer purchased a home for $500,000 and will use the home as his principal residence. He paid $50,000 down and obtained a $450,000 mortgage. Will Taxpayer be entitled to a deduction for the interest he pays on the mortgage?

Chapter 17, E.1 Taxpayer worked in Charlotte, North Carolina. In addition to paying federal income tax, Taxpayer also paid state and city income taxes. If she itemizes, can Taxpayer deduct the federal, state, and city income taxes she paid?