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COST OF SALES (Tables) | 12 Months Ended
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Dec. 31, 2020
Analysis of income and expense [abstract] |
Schedule of cost of sales |
|  | Year ended December 31,
|  | 2020 |  | 2019 |  | 2018
Inventories at the beginning of the year |  | 2,158,298 |  |  | 2,689,829 |  |  | 2,550,930 |
Effect of initial inflation adjustment (Note 3 (cc)) |  | — |  |  | — |  |  | 191,708 |
Translation differences |  | — |  |  | (21,919) |  |  | (413,436) |
Plus: Charges for the year |  |  |  |  |  |
Raw materials and consumables used and other movements |  | 5,359,938 |  |  | 6,165,654 |  |  | 6,961,704 |
Services and fees |  | 112,924 |  |  | 151,373 |  |  | 158,551 |
Labor cost |  | 546,045 |  |  | 611,615 |  |  | 699,447 |
Depreciation of property, plant and equipment |  | 527,283 |  |  | 508,934 |  |  | 456,522 |
Amortization of intangible assets |  | 14,624 |  |  | 17,805 |  |  | 25,374 |
Maintenance expenses |  | 371,368 |  |  | 467,090 |  |  | 519,625 |
Office expenses |  | 6,131 |  |  | 8,513 |  |  | 8,586 |
Insurance |  | 10,641 |  |  | 9,674 |  |  | 8,769 |
Change of obsolescence allowance |  | (1,279) |  |  | 8,413 |  |  | 17,322 |
Recovery from sales of scrap and by-products |  | (20,892) |  |  | (23,793) |  |  | (27,744) |
Others |  | 16,623 |  |  | 17,550 |  |  | 15,799 |
Less: Inventories at the end of the year |  | (2,001,781) |  |  | (2,158,298) |  |  | (2,689,829) |
Cost of Sales |  | 7,099,923 |  |  | 8,452,440 |  |  | 8,483,328 |

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