Answer:
D. $4,000 increase
Step-by-step explanation:
Net Income = Sales revenue - Variable costs - Special costs (for executing this order)
15 X 3,000 - 12 X 3,000 - 1 X 3,000
Or, Net Income = 30,000 - 24,000 - 2,000
Or, Net Income = 4,000
Thus, option D is the correct answer.