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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Dec. 27, 2019 | Dec. 28, 2018
Net sales | $ 128,054 | $ 104,440
Cost of sales | 74,442 | 60,121
Gross profit | 53,612 | 44,319
Operating expenses: |  |
Marketing and selling | 29,305 | 24,693
Administrative management, finance and information systems | 11,975 | 8,387
Research and development | 5,531 | 5,261
Total operating expenses | 46,811 | 38,341
Operating profit | 6,801 | 5,978
Interest income | (655) | (540)
Interest expense | 35 | 37
Other (income) expense, net | (1,168) | 2,150
Profit before income taxes | 8,589 | 4,331
Income tax expense | 2,159 | 810
Net income | $ 6,430 | $ 3,521
Weighted average common shares - Basic: |  |
Participating securities (shares) | 27 | 43
Weighted average common shares - Dilutive (shares) | 10,039 | 10,008
Class A |  |
Weighted average common shares - Basic: |  |
Weighted average common shares - Basic (shares) | 8,800 | 8,753
Net income per common share - Basic: |  |
Net income per common share - Basic (USD per share) | $ 0.65 | $ 0.36
Net income per common share - Diluted: |  |
Net income per common share - Diluted (USD per share) | $ 0.64 | $ 0.35
Class B |  |
Weighted average common shares - Basic: |  |
Weighted average common shares - Basic (shares) | 1,212 | 1,212
Net income per common share - Basic: |  |
Net income per common share - Basic (USD per share) | $ 0.59 | $ 0.32
Net income per common share - Diluted: |  |
Net income per common share - Diluted (USD per share) | $ 0.64 | $ 0.35

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