Coldman Enterprises uses a periodic inventory system. Its records show the following for the month of March, in which 280 units were sold for a total of $2,800 cash: Number of units Cost per unit Date March 1 March 15 March 25 Total Inventory. beginning Purchase Purchase 200 100 100 400 $5.00 $5.30 $5.50 Total cost $1,000 $530 $550 $2,080 Coldman uses an average cost inventory costing method to compute cost of goods sold and value ending inventory