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6. Critical accounting estimates and judgments (Tables) | 12 Months Ended
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Dec. 31, 2018
Critical Accounting Estimates And Judgments Tables Abstract |
Loss expected percentage |
| Number of days
| 0-30 |  | 30-60 |  | 60-90 |  | 90-120 |  | 120-150 |  | +150
Loss expected percentage | 8% |  | 12% |  | 19% |  | 26% |  | 59% |  | 69%
Provisions for impairments |
Amount of the provisions for impairment of the trade receivables at 12.31.2017 by IAS 39 |  |  | (458,853)
Adjustment of expected losses IFRS 9 |  |  | (82,041)
Amount of the provisions for impairment of the trade receivables at 12.31.2017 by IAS 39 |  |  | (540,894)

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