XYZ Inc. sells a single product for $10 per unit. Variable production costs are $5 per unit. Fixed overhead costs amount $10,000 per month. Variable selling costs are $1 per unit. Fixed selling costs are $5,000 per month. Last month, the company produced 10,000 units and sold 8,000 units. If sales were to increase by 3,000 units, by how much would operating profit increase? Multiple Choice

1-$8,000

2-$12,000

3-$10,000

4-$4,000