Final answer:
The activity-based overhead rate per purchase order can be calculated by dividing the total overhead costs by the number of purchase orders.
Step-by-step explanation:
The activity-based overhead rate per purchase order can be calculated by dividing the total overhead costs by the number of purchase orders. Without additional information, we cannot determine the specific rate for this scenario. However, we can calculate the rate if we have the total overhead costs and the number of purchase orders. Once we have these values, we can divide the total overhead costs by the number of purchase orders to get the activity-based overhead rate per purchase order.