Costello Corporation uses a perpetual inventory system. At the end of the year, the inventory balance reported by its system is $45,270. Costello performs an inventory count and determines that the actual ending inventory is $39,780. 

. Discuss why a company that uses a perpetual inventory system would perform a physical inventory count. 

. Why might the ending balance in inventory differ between the perpetual inventory system and physical inventory count? 

. Assume that Costello determines that the difference is due to a part of its inventory being damaged when a warehouse worker backed into a shelf with his forklift. What journal entry should Costello make?


 . Assume that Costello believes the difference is due to errors made by its accounting staff. The staff failed to transfer inventory to cost of goods sold when sales were made. Record the journal entry Costello should make in this case