A firm produces one kind of product and charges $\$12$ for each batch sold. Its variable cost comes to $\$4$ per batch. Fixed costs are absorbed using a normal output level of $1000$ batches, at $\$3$ per batch. What is the profit under marginal costing if the firm produces and sells $1500$ batches?
- A$\$6000$
- B$\$7500$
- C$\$9000$
- D$\$12000$