(All amounts in millions)
	2017			2016			2015			2014
Raw Material Inventory	377			391			427			399
Work in Process Inventory	0			0			0			0
Finished Goods Inventory	525			549			566			617
Total Inventory	902			940			993			1,016
Net sales	7,890			7,961			8,082
Cost of Goods Sold	4,831			5,181			5,300
Gross profit	3,059			2,780			2,805
Gross profit ratio	38.8	%		34.9	%		34.4	%

1. Calculate the inventory turnover and day's sales in inventory for 2017, 2016, and 2015.