Mark quits his job as a company financial officer (CFO), where he was earning $50,000 per year to start his own financial consulting firm. He converts a building that he owns, which was previously rented for $12,000 per year, into and office. Also, he withdraws and uses his $100,000 savings, on which he was earning $5,000 (5 percent) interest per year, to start his business. In his first year of business, he earns $150,000 and has the following expenses: Utilities, $12,000; wages (paid to an assistant), $30,000, and materials, $20,000. Mark tells his friends that despite making profit, it is too costly for him to continue running his consulting firm. How do you justify Mark's claim. Please show all work.