Answer:
The estimated cost of the ending inventory is $120,000
Explanation:
Retail Inventory method is used to estimate the value of inventory using retail price of the inventory.
Ending inventory is the value of Inventory in store at the end of accounting period. It is calculated as follow
Closing Inventory value = Goods available for sales - Goods sold during the period
As the Inventory is already given in the retail value
Closing Inventory value = $400,000 - $280,000 = $120,000