The beginning inventory of DEF Inc. and data on purchases and sales for a three-month period are as follows: NUMBER OF RUNNING COST PER UNIT $20 $21 TOTAL $2,000 $10,500 DATE TRANSACTION UNITS INVENTORY 100 500 300 100 150 5,000 4,000 300 6,000 1,250 1,500 1,000 June1 Inventory 10 Purchase 1 18 Sale1 20 Sale 2 10 Sale 3 15 Purchase 2 20 Sale 4 25 Sale 5 600 300 200 50 5,050 1,050 750 6.750 5,500 7,000 6,000 July $22 $110,000 $23 $138,000 August 8 Purchase 17 Sale 6 28 Purchase 4 31 Sale 7 $24 $36,000