The total activity costs for the return and shipping activities of product 1 are -
Total activity costs for the return and shipping activities = (Per return costs X number of returns) + (Per shipping costs X number of shipments)
Total activity costs for the return and shipping activities = ($ 45 X 150 returns) X ($ 10 X 1,200 shipments)
Total activity costs for the return and shipping activities = $ 18,750