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How many working days in year 2022?
Here is the detail of the calculation:
Because 2022 is not a leap year, it has 365 days.
Let's remove 53 saturdays and 52 sundays. It remains 260 days.
Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 252 working days in 2022.
 Here is the list of these 8 public holidays: 
 
 1. Terça-feira de Carnaval : Tuesday, 1 March, 2022 
2. Sexta Feira Santa ou Paixão de Cristo  : Friday, 15 April, 2022 
3. Tiradentes : Thursday, 21 April, 2022 
4. Corpus Christi : Thursday, 16 June, 2022 
5. Independência do Brasil : Wednesday, 7 September, 2022 
6. Nossa Senhora Aparecida : Wednesday, 12 October, 2022 
7. Finados : Wednesday, 2 November, 2022 
8. Proclamação da República Brasileira : Tuesday, 15 November, 2022 
And here are the 4 public holidays falling on a weekend:
1. Confraternização Universal : Saturday, 1 January, 2022 
2. Dia do Trabalho : Sunday, 1 May, 2022 
3. Dia Nacional de Zumbi e da Consciência Negra : Sunday, 20 November, 2022 
4. Natal : Sunday, 25 December, 2022