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Periodic Inventory. Using FFO, LiFo, and Wrighted Average Cost Methods The units of an stem avaitable for sale during the year were as follows: There are 20 units of the iem in the phyiaal inventory at December 31 . The periodic in (b) the last-in, first-out (UFO) method; and (c) the weighted averege cost method (Rot Fardteat Torwar My won. a. When the FiFD method is wyed, coses are included in cost of merchandise sold it b. When the LHO method is ated, the cast of the units sold is the cost of the most The average cost method a nomemes calied the weighted average method. Thi terding merchandise invertank