Final answer:
To compute equivalent units of production, all of the following are needed: percentage completion in opening inventory, percentage completion in ending inventory, and equivalent units in opening inventory.
Step-by-step explanation:
The items needed to compute equivalent units of production include: a. Percentage completion in opening inventory, b. Percentage completion in ending inventory, c. Equivalent units in opening inventory. Therefore, the correct answer to which items are needed is d. All the above are needed to compute equivalent units of production. This computation helps businesses in assessing costs and work-in-progress during an accounting period. It is a crucial concept in management accounting that deals with the calculation of the number of complete units that could have been produced given the total amount of direct materials, labor, and overhead costs incurred.