In 2018, a single individual operates a business as a sole proprietorship. The business sells shoes on the internet. Other than inventory, accounts receivable, and fully depreciated computers, the business has no assets. The business has revenue of $450,000 and expenses of $200,000 in a given year, of which $80,000 is for wages. The individual also earns $10,000 from an outside part-time job. The individual's average tax rate is 32% on the given income, and the corporate tax rate is 21%.Assume the individual does not itemize and that the standard deduction is $12,000.

What is this individual's income tax liability?

$52,500

$53,760

$63,360

$66,560

I know the answer is $66,560. The only other explanation I found said the answer is $53,760 but that's the wrong answer, I need to know how to arrive at $66,560.