Expenses

RESULTS OF OPERATIONS
Operating Expenses:
Three months ended Six months ended
June 30 June 30
(Percent of net sales) 2009   2008   Change 2009   2008   Change
Cost of sales   52.1 % 52.1 % % 53.2 % 51.9 % 1.3 %
Selling, general and administrative expenses 21.7 20.7 1 22.5 20.2 2.3
Research, development and related expenses   5.4   5.4     5.9   5.4   0.5  
(Gain)/loss on sale of business 0.3 (0.3 ) 0.2 (0.2 )
Operating income   20.8 % 21.5 % (0.7 )% 18.4 % 22.3 % (3.9 )%
Interest Expense and Income:
Three months ended Six months ended
June 30 June 30
(Millions) 2009   2008 2009   2008
Interest expense   $ 55   $ 51   $ 110   $ 106  
Interest income (7 ) (18 ) (18 ) (48 )
Total   $ 48   $ 33   $ 92   $ 58  
Provision for Income Taxes:
Three months ended Six months ended
June 30 June 30
(Percent of pre-tax income) 2009   2008 2009   2008
Effective tax rate   30.8 % 32 % 30.5 % 31.9 %
Noncontrolling Interest:
Three months ended Six months ended
June 30 June 30
(Millions) 2009   2008 2009   2008
Noncontrolling Interest   $ 9   $ 18   $ 21   $ 36