Charles is a self-employed CPA who maintains a qualifying office in his home, which is 10% of his total home square footage.Charles has a business profit of $3,000.Charles mortgage interest paid was $20,000 and real estate taxes paid was $6,000 for the year.Other home-office expenses were $14,000 and consist of utilities, insurance, maintenance and depreciation.What is Charles' total allowable home office expense deduction for 2019?