Red Sea Enterprises makes a variety of products that it sells to other businesses. The company's activity-based costing system has four activity cost pools for assigning costs to products and customers. Details concerning that ABC system are listed below: Activity Cost Pool Supporting assembly Processing batches Processing orders Serving customers Activity Measure Direct labor-hours (DLHs) Number of batches Number of orders Number of customers $ $ $ $ Activity Rate 3.50 per DLH 114.05 per batch 66.95 per order 2,026 per customer The cost of serving customers, $2,026 per customer, is the cost of serving a customer for one year. Koerner Corporation buys only one of the company's products. The details of last year's purchases of this product are listed below: Number of units purchased Number of batches Number of orders Direct labor-hour requirement Selling price Direct materials cost Direct labor cost 900 units 13 batches 4 order 0.10 DLHs per unit $ 25.75 per unit $ 7.95 per unit $ 1.50 per unit According to the ABC system, what is the customer margin for this customer in past year