Quarterly Data (Unaudited)

12 Months Ended

Dec. 31, 2011

Quarterly Data (Unaudited)

Quarterly Data (Unaudited)

NOTE 19.  Quarterly Data (Unaudited)

(Millions, except per-share amounts) 2011	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year 2011
Net sales	$	7,311	$	7,680	$	7,531	$	7,089	$	29,611
Cost of sales	3,802		4,040		4,027		3,824		15,693
Net income attributable to 3M	1,081		1,160		1,088		954		4,283
Earnings per share attributable to 3M common shareholders — basic	1.52		1.63		1.54		1.36		6.05
Earnings per share attributable to 3M common shareholders — diluted	1.49		1.60		1.52		1.35		5.96
(Millions, except per-share amounts) 2010	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year 2010
Net sales	$	6,348	$	6,731	$	6,874	$	6,709	$	26,662
Cost of sales	3,238		3,435		3,583		3,575		13,831
Net income attributable to 3M	930		1,121		1,106		928		4,085
Earnings per share attributable to 3M common shareholders — basic	1.31		1.57		1.55		1.30		5.72
Earnings per share attributable to 3M common shareholders — diluted	1.29		1.54		1.53		1.28		5.63

Gross profit is calculated as net sales minus cost of sales. In the first quarter of 2010, a charge resulting from the March 2010 enactment of the Patient Protection and Affordable Care Act, including modifications made in the Health Care and Education Reconciliation Act of 2010, decreased net income attributable to 3M by $84 million ($0.12 per diluted share impact on year 2010).