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$[[$Date of Purchase,Purchases$],[$January $10,$Units,Unit Cost$*,$Total cost$],[$January $18,6,000,$$$7,$$$42,000$

$5.$ Calculate January's ending inventory and cost of goods sold for the month using Average cost, perpetual system. Note: Round average cost per unit to $4$ decimal places. Enter sales with a negative sign.