please show all calculations.

D) $1,8/5. 2. Christopher is a self-employed Engineer who maintains a qualifying office in his home. Christopher has $95,000 gross income from his practice and incurs $75,000 in salaries, supplies. computer services, etc. Christopher's mortgage interest and real estate taxes allocable to the office total $12,000. Other expenses total $10.500 and consist of depreciation, utilities, insurance, and maintenance. What is Christopher's total home office expense deduction? A) $20,000 B) $22,500 C) $75,000 D) $97,500