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How many working days in year 1973?

Here is the detail of the calculation:

Because 1973 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1973.

Here is the list of these 10 public holidays:

1. Confraternização Universal : понедельник, 1 январь, 1973
2. Terça-feira de Carnaval : вторник, 6 март, 1973
3. Sexta Feira Santa ou Paixão de Cristo : пятница, 20 апрель, 1973
4. Dia do Trabalho : вторник, 1 май, 1973
5. Corpus Christi : четверг, 21 июнь, 1973
6. Independência do Brasil : пятница, 7 сентябрь, 1973
7. Nossa Senhora Aparecida : пятница, 12 октябрь, 1973
8. Finados : пятница, 2 ноябрь, 1973
9. Proclamação da República Brasileira : четверг, 15 ноябрь, 1973
10. Natal : вторник, 25 декабрь, 1973

And here are the 2 public holidays falling on a weekend:

1. Revolução Pernambucana de 1817 : воскресенье, 4 март, 1973
2. Tiradentes : суббота, 21 апрель, 1973