Calculate the taxpayers 2019 qualifying business income deduction for a qualified trade of business

Filing status: single

Taxable Income: 180,000

Net Capital Gains: 0

Qualified business Income : 80,000

W-2 Wages: 20,000

Country: U.S.

The previous tudor answered the question incorrectly with 16,000, that was my initial guess. Then I tried 10,000 due to the limitation-that would be 50% of w-2 wages. The check my work function says the answer is 13,684 and i have no idea how they got that