A customer has requested a special order of 2,000 Wilson tennis rackets for $40 per unit. The normal selling price is $50. Costs related to the special order are $30 per racket plus batch-level costs of $1,000. Wilson incurred $10,000 of product-level costs to design the racket and has $100,000 of facility-level costs per year. The differential revenue associated with the special order is ______