Orion Iron Corporation tracks the number of units purchased and sold throughout each year but applies its inventory costing method at the end of the year, 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$[[$Transactions$,$Units,Unit Cost$],[\backslash$table$[[$a$.$ Inventory, Beginning$],[$For the year:$]],300,$$$19$