E6A-1 Calculating periodic inventory amounts [1015 min] The periodic inventory records of Synergy Prosthetics indicate the following at 31 July: Jul 1 8 15 26 Beginning inventory Purchase Purchase Purchase 6 units @ $60 5 units @ $67 10 units @ $70 5 units @ $85 At 31 July, Synergy counts two units of inventory on hand. Requirement Calculate ending inventory and cost of sales, using each of the following methods: a average cost (round average unit cost to the nearest cent) b first in, first out clast in, first out