Tammy, a single taxpayer, has a part-time job at BigCo, a company in which she has no ownership interest. In addition, she owns and operates LittleCo, a sole proprietorship that is a qualified trade or business. Tammy is paid wages of $40,000 by BigCo, and reports $100,000 in qualified business income from LittleCo. She has no other items of income or loss and $25,000 of itemized deductions.

What is her qualified business income deduction?