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30 Equity (Details 2) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net income for the year | R$ 1,989,946 | R$ 1,407,063 | R$ 1,033,626
Legal Reserve (5%) | (99,497) | (70,353) | (51,681)
Realization of equity evaluation adjustment | 66,226 | 67,086 | 71,650
Calculation basis for minimum mandatory dividends | 1,956,675 | 1,403,796 | 1,053,595
Minimum mandatory dividend | 489,169 | 350,949 | 263,399
Total proposed distribution | 643,000 | 378,542 | 289,401
Interest on own capital, net | 643,000 | 280,000 | 266,000
Tax on interest on own capital | (56,584) | (27,593) | (26,002)
Interest on own capital, net | 586,416 | 252,407 | 239,998
Dividends proposed |  | 98,542 | 23,401
Total proposed distribution, net | 586,416 | R$ 350,949 | R$ 263,399
Proposed additional dividend | 97,247 |  |
Interest on own capital, net, in advance, endorsed by CAD | R$ 97,247 |  |
Gross value of dividends per share: ordinary shares | R$ 2.24235 | R$ 1.3195 | R$ 1.00801
Gross amount of dividends per class of shares: ordinary shares | R$ 325,210 | R$ 191,369 | R$ 146,193
Class "A" Preferred [Member] |  |  |
Gross value of dividends per share, preferred | R$ 3.94657 | R$ 2.8905 | R$ 2.8905
Gross amount of dividends per class of shares, preferred | R$ 1,291 | R$ 950 | R$ 950
Class "B" Preferred [Member] |  |  |
Gross value of dividends per share, preferred | R$ 2.46692 | R$ 1.45151 | R$ 1.10883
Gross amount of dividends per class of shares, preferred | R$ 316,499 | R$ 186,223 | R$ 142,258

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