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v3.19.1

EXPENSES BY NATURE (Tables) | 12 Months Ended
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Dec. 31, 2018
EXPENSES BY NATURE |
Schedule of expenses classified by nature |
|  | 2018 |  | 2017 |  | 2016
Depreciation and amortization |  | (1,891,814) |  | (2,092,551) |  | (2,535,955)
Labor expenses |  | (5,724,352) |  | (5,514,721) |  | (6,508,834)
Raw material and consumption material |  | (29,623,418) |  | (23,423,950) |  | (22,863,693)
Freight |  | (2,770,516) |  | (2,281,773) |  | (2,279,459)
Impairment of assets |  | — |  | (1,114,807) |  | (2,917,911)
Gains and losses on assets held for sale and sales of interest in subsidiaries |  | (414,507) |  | (721,682) |  | (58,223)
Reversal of provision for tax liabilities, net |  | — |  | 929,711 |  | —
Other expenses/income, net |  | (1,697,786) |  | (1,563,177) |  | (2,111,181)
|  | (42,122,393) |  | (35,782,950) |  | (39,275,256)
Classified as: |  |  |  |  |  |
Cost of sales |  | (40,010,100) |  | (33,312,995) |  | (34,187,941)
Selling expenses |  | (570,431) |  | (524,965) |  | (710,766)
Allowance for doubtful accounts |  | (9,914) |  | — |  | —
General and administrative expenses |  | (1,082,449) |  | (1,129,943) |  | (1,528,262)
Other operating income |  | 235,421 |  | 260,618 |  | 242,077
Other operating expenses |  | (270,413) |  | (168,887) |  | (114,230)
Impairment of assets |  | — |  | (1,114,807) |  | (2,917,911)
Gains and losses on assets held for sale and sales of interest in subsidiaries |  | (414,507) |  | (721,682) |  | (58,223)
Reversal of provision for tax liabilities, net |  | — |  | 929,711 |  | —
|  | (42,122,393) |  | (35,782,950) |  | (39,275,256)

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