Consolidated Statements of Income 2010 Years ended December 31 millions) 2012 2011 Net sales $29,904 29,611 226,662 Operating expenses 15,685 15,693 13,831 Cost of sales Selling, general and administrative expenses 6,102 6,170 5,479 Research, development and related expenses 1,634 1,570 1,434 23,421 23,433 20,744 Total operating expenses Operating income 6,483 6,178 5,918 Interest expenses and income 201 186 Interest expense (39) (39) (38) Interest income 132 147 163 Total interest expense--net Income before income taxes 6,351 6,031 5,755 1,840 1,674 1,592 Provision for income taxes Net income including noncontrolling interest $4,511 $4,357 $4,163 Less: Net income attributable to noncontrolling interest 67 74 78 Net income attributable to 3M 4,444 4,283 4,085