Marc, a single taxpayer, earns $100,000 in taxable income and $10,000 in interest from an investment in city of Birmingham Bonds. If Marc earned an additional $80,000, what would his 2018 marginal tax rate be on the $80,000 (rounded)? (Tax rate schedule)

I need walked through how you got the numbers from the table. Please give me as much info as possible not just a table with numbers on it. I dont understand how the table is getting broken down.