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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
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Jul. 28, 2018 | Jul. 29, 2017
Sales | $ 1,612,015 | $ 1,604,574
Cost of sales | 1,173,013 | 1,167,863
Gross profit | 439,002 | 436,711
Operating and administrative expense | 380,550 | 371,495
Depreciation and amortization | 24,999 | 24,482
Operating income | 33,453 | 40,734
Interest expense | (4,460) | (4,452)
Interest income | 3,845 | 2,841
Income before income taxes | 32,838 | 39,123
Income taxes | 7,758 | 16,202
Net income | $ 25,080 | $ 22,921
Class A Common Stock |  |
Net income per share: |  |
Basic (in dollars per share) | $ 1.95 | $ 1.80
Diluted (in dollars per share) | 1.74 | 1.60
Class B Common Stock |  |
Net income per share: |  |
Basic (in dollars per share) | 1.27 | 1.16
Diluted (in dollars per share) | $ 1.27 | $ 1.16

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