Sales=1,000,000, Gross Profit=200,000 & Inventory= 400000

 asume  begening  inventory  zero 

CGS/ average inventory  ((beg inventory +ending inventory)/2)

800000 / 200000 =  4

or else  beg inv  was  400000 

CGS /average inv  =  2

inventory turnover equals the cost of goods sold or net sales divided by the average inventory and the answer is2