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Net Revenue from Sale and Services | 12 Months Ended
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Dec. 31, 2019
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Net Revenue from Sale and Services | 27. Net Revenue from Sale and Services
|  | 2019 |  |  | 2018 |  |  | 2017 |
Gross revenue from sale |  |  | 94,296,759 |  |  |  | 94,693,178 |  |  |  | 82,121,646 |
Gross revenue from services |  |  | 869,084 |  |  |  | 750,791 |  |  |  | 728,590 |
Sales taxes |  |  | (4,031,295 | ) |  |  | (3,027,597 | ) |  |  | (2,237,203 | )
Discounts and sales returns |  |  | (1,494,814 | ) |  |  | (1,342,799 | ) |  |  | (927,557 | )
Amortization of contractual assets with customers (see Note 11) |  |  | (355,250 | ) |  |  | (371,825 | ) |  |  | (463,049 | )
Deferred revenue (see Note 24) |  |  | 13,491 |  |  |  | (3,765 | ) |  |  | 7,587 |
Net revenue from sales and services |  |  | 89,297,975 |  |  |  | 90,697,983 |  |  |  | 79,230,014 |

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