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$],[$a$.$ Inventory, Beginning,$500,$$$10.$

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Please complete requirments $3$ and $4.$

With requirement $4$ being formatted the same in the pic. Thank you

$\backslash$table$[[$Transactions$,$Units,Unit Cost$],[$a$.$ Inventory, Beginning,$500,$$$10$