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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Sales: |  |  |
Total sales |  | $ 528,096 | $ 648,187
Cost and expenses: |  |  |
(Increase) decrease in the fair value of derivative instruments | [1] | 19,030 | 17,636
Delivery and branch expenses |  | 94,364 | 97,936
Depreciation and amortization expenses |  | 8,386 | 7,837
General and administrative expenses |  | 7,021 | 6,856
Finance charge income |  | (771) | (1,319)
Operating income |  | 21,621 | 23,605
Interest expense, net |  | (3,218) | (4,274)
Amortization of debt issuance costs |  | (250) | (329)
Income before income taxes |  | 18,153 | 19,002
Income tax expense |  | 5,174 | 5,463
Net income |  | 12,979 | 13,539
General Partner's interest in net income |  | 118 | 122
Limited Partners' interest in net income |  | $ 12,861 | $ 13,417
Basic and diluted income per Limited Partner Unit: | [2] | $ 0.32 | $ 0.33
Weighted average number of Limited Partner units outstanding: |  |  |
Weighted average number of Limited Partner units outstanding, Basic |  | 35,593 | 35,916
Weighted average number of Limited Partner units outstanding, Diluted |  | 35,593 | 35,916
Product |  |  |
Sales: |  |  |
Total sales |  | $ 448,550 | $ 569,929
Installations and services |  |  |
Sales: |  |  |
Total sales |  | 79,546 | 78,258
Cost of product |  |  |
Cost and expenses: |  |  |
Cost and expenses |  | 303,338 | 419,093
Cost of installations and services |  |  |
Cost and expenses: |  |  |
Cost and expenses |  | $ 75,107 | $ 76,543
[1] | Represents the change in value of unrealized open positions and expired options.
[2] | See Note 15 - Earnings Per Limited Partner Unit.

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