Anderson Company just started business and made the following four inventory purchases in September Date Units Total Cost Sept 1 100 units $ 100 Sept 10 150 units 300 Sept 15 200 units 500 Sept 28 250 units 500 $1,400 On September 29, 400 units were sold for $4 each. A physical count of merchandise inventory on September 30 reveals that there are 300 units on hand.