Sebastian Company manufactures and sells sportswear products. Sebastian 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 $60 per return, and the shipping activity has an activity rate of $20 per shipment. Sebastian shipped 4,000 units of Product 1 in 800 shipments (some shipments are more than one unit). There were 90 returns.

Determine the per-unit customer costs for combined shipping and returns of Product 1.

a.$5.35 per unit

b.$80 per unit

c.$1.38 per unit

d.$359.55 per unit