4. Starling Sweaters Company uses the periodic inventory system. Starling had the following inventory purchases during the year: Date 1-1 3-1 6-1 9-1 Total # of units 100,000 150,000 200,000 300.000 750,000 Cost per Unit $4 $5 $6 $7 Total Cost $400,000 $750,000 $1,200,000 $2.100.000 $4,450,000 During the year 600,000 units were sold. The ending inventory is 150,000 units, Required: Calculate cost of goods sold and ending inventory using first in first out, last in first out, and weighted average