Explanation needed

The following exhibit gives details about the order clerk, return clerks and delivery/pickup staff: Order Clerks Return Clerks Delivery/Pickup Staff $640,000 8,000 Total Cost Total hours worked $48,000 1,920 $63,000 1,800 Order Taking Delivery/Pickup Return Processing 1.0 Hours per batch 0.5 2.0 Customer Units Purchased Units per batch 1 2. 3 5,000 5,000 5,000 100 25 50 Number of Orders Processed 50 200 100 Number of Orders Returned 2 50 25 What is the total cost of processing the returns of Customer 2? $4,000 X $5,250 None of the other choices $1,750