Charles is a self-employed CPA who maintains a qualifying office in his home. Charles has $60,000 gross income from his practice and incurs $48,000 in salaries, supplies, computer services, etc. Charles”s mortgage interest and real estate taxes allocable to the office total $5,000. Other expenses total $14,000 and consist of depreciation, utilities, insurance, and maintenance. What is Charles total home office expense deduction? A. $5,000 b. $12,000 c. $14,000 d. $19,000 b, p. I:9-25; Example I:9-53.