The above answer can be explained as under.
The total inventory of Barrington = Beginning Inventory + Purchases
Beginning Inventory = $ 100,000, Purchases = $ 750,000
Ending inventory = $ 90,000
Inventory consumed = total inventory of Barrington - Ending inventory = $ 750,000 - $ 90,000
Inventory consumed = $ 660,000
The journal entry to record inventory consumed -
Cost of goods sold ...... Dr.... $ 660,000
Merchandise Inventory.....Cr.... $ 660,000