Weighted average cost method with perpetual inventory The beginning inventory at Dunne Co. and data on purchases and sales for a three-month period ending June 30 are as follows: Dunne Co. Schedule of Cost of Goods Sold Weighted Average Cost Method For the Three Months Ended June 30 2. Determine the total sales, the total cost of aoods sold, and the aross profit from sales for the period. 3. Determine the ending inventory cost on June 30