Vaughn Inc. uses the perpetual inventory system and the weighted average cost formula to value inventories. On August 1, there were 5000 units valued at $14000 in the beginning inventory. On August 10, 11000 units were purchased for $6 per unit. On August 15, 8000 units were sold for $11 per unit. The amount charged to cost of goods on August 15 was O $32000. O $40000 O $48000 O $32800