Ranada Company manufactures and sells sportswear products. Ranada uses activity-based costing to determine the cost of the customer return processing and the shipping activity. The customer return processing activity has an activity rate of $45 per return, and the shipping activity has an activity rate of $10 per shipment. Ranada shipped 3,000 units of Product 1 in 1,200 shipments (some shipments are more than one unit). There were 150 returns. Determine the per-unit customer costs for combined shipping and returns of Product 1.