a company uses the weightedaverage method of inventory valuation under a periodic inventory system. the company began the year with a zero inventory balance. they had the following transactions during the year. 1. purchased units at per unit 2. purchased units at per unit 3. sold units at per unit 4. purchased units at per unit 5. sold units at per unit at the end of the​ year, the company counted the inventory and found units remaining. calculate the cost of goods sold for the year.​ (round the unit costs to two decimal places and total costs to the nearest​ dollar.)