Altira Corporation uses a perpetual inventory system. The following transactions affected its merchandise inventory during the month of August 2016: Aug.1 Inventory on hand2,600 units; cost $6.70 each. 8 Purchased 13,000 units for $6.10 each. 14 Sold 10,400 units for $12.60 each. 18 Purchased 7,800 units for $5.60 each. 25 Sold 9,400 units for $11.60 each. 31 Inventory on hand3,600 units. I need help and how to calculate the cost of sold -August 25 #of units sold beg inventory ( zero) . In August 8 purchase here is were i'm totally confused. Need step by step to understand how to get this results please.