shares in Millions, $ in Millions	2018	2017	2016
Income Statement
Net Sales	$108,203	$100,904	$94,595
Cost of sales	71,043	66,548	62,282
Gross profit	37,160	34,356	32,313
Operating expenses:
Selling, general and administrative	19,513	17,864	17,132
Depreciation and amortization	1,870	1,811	1,754
Impairment loss	247	0	0
Total operating expenses	21,630	19,675	18,886
Operating income	15,530	14,681	13,427
Interest and other (income) expense:
Interest and investment income	-93	-74	-36
Interest expense	1,051	1,057	972
Other	16	0	0
Interest and other, net	974	983	936
Earnings before provision for income taxes	14,556	13,698	12,491
Provision for income taxes	3,435	5,068	4,534
Net earnings	$11,121	$8,630	$7,957
Additional Information
Basic weighted average common shares	1,137	1,178	1,229
Cash dividend per share	4.12	3.56	2.76
Operating cash flow for the year	13,038	12,031	9,783

Profitability ratios

• Gross Profit margin
• Profit margin

Solvency

• Times interest earned