A company began January with $8,000$ units of its principal product. The cost of each unit is $$6.$ Inventory transactions for the month of January are as follows:

$\backslash$table$[[$Pate of Purchase,Purchases$],[$Units$,$Unit Cost$*,$Total cost$],[6,000,$$$7,$$$42,000$

$4.$ Calculate January's ending inventory and cost of goods sold for the month using Aberage cost, periodic system.