Gladstone Company tracks the number of units purchased and sold throughout each accounting period but applies its inventory costing method at the end of each period, as if it uses a periodic inventory system. Assume its accounting records provided the following information at the end of the annual accounting period, December $31.$

$\backslash$table$[[,,$Unit$],[$Transactions$,$Units,Cost$],[$Beginning inventory, January $1,2,300,$$$60$