A person starts her own business after quitting a job in which she made $75,000 a year. Expenses include $100,000 for wages and salaries, $15,000 for utilities, $150,000 for materials and supplies, and $5000 for gasoline. She uses her own car in her work, for which she paid $16,000 two years earlier. She could rent the car for $5,000 a year. Explicit costs are
 a. $195,000
 b. $275,000
 c. $270,000
 d. $286,000