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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Sales: |  |  |  |  |
Total sales |  | $ 439,101 | $ 283,100 | $ 1,709,914 | $ 1,260,535
Cost and expenses: |  |  |  |  |
(Increase) decrease in the fair value of derivative instruments | [1] | (7,669) | (4,714) | (11,881) | (30,333)
Delivery and branch expenses |  | 83,914 | 74,871 | 280,389 | 256,500
Depreciation and amortization expenses |  | 8,067 | 8,568 | 24,596 | 24,793
General and administrative expenses |  | 6,251 | 6,209 | 18,829 | 18,770
Finance charge income |  | (1,762) | (1,079) | (3,300) | (2,284)
Operating income (loss) |  | (11,496) | (13,764) | 128,373 | 160,717
Interest expense, net |  | (2,635) | (1,957) | (7,422) | (5,944)
Amortization of debt issuance costs |  | (222) | (242) | (698) | (732)
Income (loss) before income taxes |  | (14,353) | (15,963) | 120,253 | 154,041
Income tax expense (benefit) |  | (3,766) | (3,909) | 34,972 | 43,071
Net income (loss) |  | (10,587) | (12,054) | 85,281 | 110,970
General Partner's interest in net income (loss) |  | (93) | (98) | 726 | 879
Limited Partners' interest in net income (loss) |  | $ (10,494) | $ (11,956) | $ 84,555 | $ 110,091
Basic and diluted income (loss) per Limited Partner Unit (1): |  | $ (0.29) | $ (0.30) | $ 1.88 | $ 2.24
Weighted average number of Limited Partner units outstanding: |  |  |  |  |
Basic and Diluted |  | 36,781 | 40,041 | 37,739 | 40,897
Product |  |  |  |  |
Sales: |  |  |  |  |
Total sales |  | $ 358,236 | $ 205,045 | $ 1,481,963 | $ 1,044,748
Installations and services |  |  |  |  |
Sales: |  |  |  |  |
Total sales |  | 80,865 | 78,055 | 227,951 | 215,787
Cost of product |  |  |  |  |
Cost and expenses: |  |  |  |  |
Cost and expenses |  | 291,236 | 146,108 | 1,058,164 | 631,807
Cost of installations and services |  |  |  |  |
Cost and expenses: |  |  |  |  |
Cost and expenses |  | $ 70,560 | $ 66,901 | $ 214,744 | $ 200,565
[1] | Represents the change in value of unrealized open positions and expired options.

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