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How many working days in year 2027?
Here is the detail of the calculation:
Because 2027 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 252 working days in 2027.
 Here is the list of these 9 public holidays: 
 
 1. Confraternização Universal : Friday, 1 January, 2027 
2. Terça-feira de Carnaval : Tuesday, 9 February, 2027 
3. Sexta Feira Santa ou Paixão de Cristo  : Friday, 26 March, 2027 
4. Tiradentes : Wednesday, 21 April, 2027 
5. Corpus Christi : Thursday, 27 May, 2027 
6. Independência do Brasil : Tuesday, 7 September, 2027 
7. Nossa Senhora Aparecida : Tuesday, 12 October, 2027 
8. Finados : Tuesday, 2 November, 2027 
9. Proclamação da República Brasileira : Monday, 15 November, 2027 
And here are the 3 public holidays falling on a weekend:
1. Dia do Trabalho : Saturday, 1 May, 2027 
2. Dia Nacional de Zumbi e da Consciência Negra : Saturday, 20 November, 2027 
3. Natal : Saturday, 25 December, 2027