h) | Cost of sales |
2017 | 2016 | 2015 | ||||||||||
Inventories at the beginning of the year | 116,863 | 8,452 | 29,131 | |||||||||
Purchases | 3,718,129 | 2,868,189 | 1,574,999 | |||||||||
Operating costs (Note 8.i.) | 2,794,321 | 1,676,137 | 1,164,227 | |||||||||
Inventories at the end of the year | (105,996 | ) | (116,863 | ) | (8,452 | ) | ||||||
Total | 6,523,317 | 4,435,915 | 2,759,905 | |||||||||