| 6. | COST OF SALES |
| 12.31.2017 | 12.31.2016 | 12.31.2015 | ||||||||||||||||||||||
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Inventories at the beginning of the year |
1,893,110,238 | 1,149,148,017 | 937,789,760 | |||||||||||||||||||||
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Finished products |
141,811,446 | 88,253,896 | 100.664.946 | |||||||||||||||||||||
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Products in progress |
611,224,018 | 221,614,930 | 142.891.109 | |||||||||||||||||||||
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Raw materials, materials, spare parts and fuels |
1,140,074,774 | 839,279,191 | 694,233,705 | |||||||||||||||||||||
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Acquisition of inventories from business combination under common control (Note 16) |
181,795,914 | |||||||||||||||||||||||
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Currency translation differences |
37,467,329 | |||||||||||||||||||||||
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Purchases and production expenses for the year |
10,968,000,755 | 7,826,688,763 | 6,019,855,732 | |||||||||||||||||||||
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Purchases |
1,717,979,151 | 1,186,017,343 | 982,393,494 | |||||||||||||||||||||
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Production expenses |
9,250,021,604 | 6,640,671,420 | 5,037,462,238 | |||||||||||||||||||||
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Inventories at the end of the year |
(2,048,513,037 | ) | (1,893,110,238 | ) | (1,149,148,017 | ) | ||||||||||||||||||
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Finished products |
(163,360,814 | ) | (141,811,446 | ) | (88,253,896 | ) | ||||||||||||||||||
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Products in progress |
(536,131,353 | ) | (611,224,018 | ) | (221,614,930 | ) | ||||||||||||||||||
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Raw materials, materials, spare parts, fuels and transit |
(1,349,020,870 | ) | (1,140,074,774 | ) | (839,279,191 | ) | ||||||||||||||||||
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Cost of sales |
10,850,065,285 | 7,264,522,456 | 5,808,497,475 | |||||||||||||||||||||
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The detail of production expenses is as follows:
| 12.31.2017 | 12.31.2016 | 12.31.2015 | ||||||||||
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Fees and compensation for services |
151,673,784 | 47,113,221 | 34,397,004 | |||||||||
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Salaries, wages and social security charges |
2,086,896,570 | 1,481,271,792 | 1,080,334,612 | |||||||||
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Transport and travelling expenses |
88,214,842 | 58,832,563 | 41,562,188 | |||||||||
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Data processing |
8,356,653 | 5,019,037 | 3,043,006 | |||||||||
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Taxes, contributions and commissions |
167,772,786 | 118,499,467 | 94,746,427 | |||||||||
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Depreciation |
636,340,748 | 496,276,064 | 321,218,289 | |||||||||
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Preservation and maintenance costs |
1,094,651,627 | 804,883,164 | 594,298,917 | |||||||||
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Communications |
9,918,041 | 8,257,581 | 6,307,361 | |||||||||
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Leases |
24,714,188 | 24,086,042 | 9,799,723 | |||||||||
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Employee benefits |
48,680,437 | 32,901,197 | 25,540,733 | |||||||||
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Water, natural gas and energy services |
3,667,657 | 2,556,005 | 1,501,884 | |||||||||
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Freight |
1,094,050,471 | 525,926,147 | 543,209,855 | |||||||||
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Thermal energy |
1,487,981,855 | 1,169,019,254 | 937,692,064 | |||||||||
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Insurance |
22,216,570 | 17,342,955 | 12,476,569 | |||||||||
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Packaging |
372,470,018 | 344,022,485 | 267,066,779 | |||||||||
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Electrical power |
957,781,503 | 764,384,506 | 508,408,065 | |||||||||
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Contractors |
739,133,948 | 555,180,078 | 398,542,270 | |||||||||
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Tolls |
3,983,187 | 9,914,218 | 4,162,335 | |||||||||
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Canon |
11,143,956 | 8,379,420 | 22,870,512 | |||||||||
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Security |
80,169,951 | 58,181,906 | 40,943,623 | |||||||||
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Others |
160,202,812 | 108,624,318 | 89,340,022 | |||||||||
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Total |
9,250,021,604 | 6,640,671,420 | 5,037,462,238 | |||||||||
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