| Cost of services |
27. Cost of services The cost of services is as follows: | | | | | | | | | | | | Year ended December 31, | | | 2025 | | 2024 | | 2023 | Wages and salaries | | Ps. | 389,449 | | Ps. | 351,547 | | Ps. | 318,660 | Maintenance | | | 201,850 | | | 196,833 | | | 183,628 | Security and insurance | | | 190,733 | | | 172,807 | | | 146,018 | Utilities (electric, cleaning and water) | | | 237,172 | | | 210,893 | | | 192,065 | Allowance for doubtful accounts | | | 4,570 | | | 17,621 | | | 5,767 | Materials and supplies | | | 79,515 | | | 75,698 | | | 62,658 | Equipment lease, fees and others | | | 132,759 | | | 125,854 | | | 150,160 | | | Ps. | 1,236,048 | | Ps. | 1,151,253 | | Ps. | 1,058,956 |
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