Periodic inventory by three methods; cost of goods sold The units of an item available for sale during the year were as foliows: There are 60 units of the item in the physical inventory at December 31 . The periodic inventory system is used. Determine the ending imventory cost and the cost of goods sold by three methods, In your caleulations round average unit cost to the nearest cent, and round all other calculations and your final answers to the nearest dollar