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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Sales: |  |  |
Total sales |  | $ 488,063 | $ 528,096
Cost and expenses: |  |  |
(Increase) decrease in fair value of derivative instruments | [1] | (5,258) | 19,030
Delivery and branch expenses |  | 99,327 | 94,364
Depreciation and amortization expenses |  | 7,903 | 8,386
General and administrative expenses |  | 7,183 | 7,021
Finance charge income |  | (675) | (771)
Operating income |  | 49,219 | 21,621
Interest expense, net |  | (3,011) | (3,218)
Amortization of debt issuance costs |  | (300) | (250)
Income before income taxes |  | 45,908 | 18,153
Income tax expense |  | 13,024 | 5,174
Net income |  | 32,884 | 12,979
General Partner's interest in net income |  | 307 | 118
Limited Partners' interest in net income |  | $ 32,577 | $ 12,861
Basic and diluted income per Limited Partner Unit: | [2] | $ 0.79 | $ 0.32
Weighted average number of Limited Partner units outstanding: |  |  |
Weighted average number of Limited Partner units outstanding, Basic |  | 34,587 | 35,593
Weighted average number of Limited Partner units outstanding, Diluted |  | 34,587 | 35,593
Product |  |  |
Sales: |  |  |
Total sales |  | $ 399,459 | $ 448,550
Installations and services |  |  |
Sales: |  |  |
Total sales |  | 88,604 | 79,546
Cost of product |  |  |
Cost and expenses: |  |  |
Cost and expenses |  | 248,699 | 303,338
Cost of installations and services |  |  |
Cost and expenses: |  |  |
Cost and expenses |  | $ 81,665 | $ 75,107
[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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