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CONSOLIDATED STATMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 23, 2021 | Jan. 25, 2020 | Jan. 23, 2021 | Jan. 25, 2020
Sales | $ 522,818 | $ 437,422 | $ 1,012,954 | $ 844,824
Cost of sales | 380,973 | 319,475 | 733,146 | 613,331
Gross profit | 141,845 | 117,947 | 279,808 | 231,493
Operating and administrative expense | 126,449 | 107,734 | 250,812 | 210,874
Depreciation and amortization | 8,793 | 7,798 | 17,507 | 15,237
Operating income | 6,603 | 2,415 | 11,489 | 5,382
Interest expense | (982) | (568) | (1,969) | (1,135)
Interest income | 874 | 1,030 | 1,766 | 2,289
Income before income taxes | 6,495 | 2,877 | 11,286 | 6,536
Income taxes | 1,940 | 872 | 3,370 | 1,964
Net income | $ 4,555 | $ 2,005 | $ 7,916 | $ 4,572
Common Class A |  |  |  |
Net income per share: |  |  |  |
Basic (in dollars per share) | $ 0.35 | $ 0.16 | $ 0.61 | $ 0.35
Diluted (in dollars per share) | 0.31 | 0.14 | 0.54 | 0.32
Common Class B |  |  |  |
Net income per share: |  |  |  |
Basic (in dollars per share) | 0.23 | 0.10 | 0.39 | 0.23
Diluted (in dollars per share) | $ 0.23 | $ 0.10 | $ 0.39 | $ 0.23

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