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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 27, 2019 | Jul. 28, 2018
Sales | $ 1,643,502 | $ 1,615,045
Cost of sales | 1,186,786 | 1,172,016
Gross profit | 456,716 | 443,029
Operating and administrative expense | 394,750 | 384,577
Depreciation and amortization | 27,290 | 24,999
Operating income | 34,676 | 33,453
Interest expense | (4,436) | (4,460)
Interest income | 5,283 | 3,845
Income before income taxes | 35,523 | 32,838
Income taxes | 9,984 | 7,758
Net income | $ 25,539 | $ 25,080
Class A Common Stock |  |
Net income per share: |  |
Basic (in dollars per share) | $ 1.98 | $ 1.95
Diluted (in dollars per share) | 1.77 | 1.74
Class B Common Stock |  |
Net income per share: |  |
Basic (in dollars per share) | 1.29 | 1.27
Diluted (in dollars per share) | $ 1.29 | $ 1.27

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