Answer:
The correct answer is D.
Step-by-step explanation:
Giving the following information:
The last 500 cigars we produced and sold increased revenue by $7,500 and costs by $7,000.
The increase in profit by the last 500 cigars:
7500 - 7000= $500
If the firm had not produced the las 500 cigars, the profit would have decreased by $500.