PA$7-1($Algo$)$ Analyzing the Effects of Four Alternative Inventory Methods in a Periodic Inventory System $[$LO $7-3]$

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$[[$Transactions$,,$Unit$],[$Beginning inventory, January $1,3,100,$$$40$