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How many working days in year 1988?
Here is the detail of the calculation:
Because 1988 is a leap year, it has 366 days.
Let's remove 53 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 11 public holidays that do not fall during a weekend and we obtain 250 working days in 1988.
 Here is the list of these 11 public holidays: 
 
 1. Solenidade da Santa Mãe de Deus : Friday, 1 January, 1988 
2. Sexta-Feira Santa : Friday, 1 April, 1988 
3. Dia da Liberdade : Monday, 25 April, 1988 
4. Dia dos Açores : Monday, 23 May, 1988 
5. Corpo de Deus : Thursday, 2 June, 1988 
6. Dia de Portugal, de Camões e das Comunidades Portuguesas : Friday, 10 June, 1988 
7. Assunção de Nossa Senhora : Monday, 15 August, 1988 
8. Implantação da República : Wednesday, 5 October, 1988 
9. Todos os Santos : Tuesday, 1 November, 1988 
10. Restauração da Independência : Thursday, 1 December, 1988 
11. Dia da Imaculada Conceição : Thursday, 8 December, 1988 
And here are the 3 public holidays falling on a weekend:
1. Páscoa : Sunday, 3 April, 1988 
2. Dia do Trabalhador : Sunday, 1 May, 1988 
3. Natal : Sunday, 25 December, 1988