please explain!

Foam Products, Incorporated, makes foam seat cushions for the automotive and aerospace industries. The company's activity-based costing system has four activity cost pools, which are listed below along with their activity measures and activity rates: The company just completed a single order from Interstate Trucking for 1,800 custom seat cushions. The order was produced in three batches. Each seat cushion required 0.7 direct labor-hour. The selling price was $141.60 per unit, the direct materials cost was $106 per unit, and the direct labor cost was $14.30 per unit. This was Interstate Trucking's only order during the year. Required: Calculate the customer margin for Interstate Trucking