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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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1988.
 Here is the list of these 10 public holidays: 
 
 1. Año Nuevo : Friday, 1 January, 1988 
2. Epifanía del Señor : Wednesday, 6 January, 1988 
3. Viernes Santo : Friday, 1 April, 1988 
4. Lunes de Pascua : Monday, 4 April, 1988 
5. San Juan : Friday, 24 June, 1988 
6. Asuncíon de la Virgen : Monday, 15 August, 1988 
7. Fiesta nacional de España : Wednesday, 12 October, 1988 
8. Todos los Santos : Tuesday, 1 November, 1988 
9. Día de la Constitución Española : Tuesday, 6 December, 1988 
10. Immaculada Concepcíon : Thursday, 8 December, 1988 
And here are the 4 public holidays falling on a weekend:
1. San José : Saturday, 19 March, 1988 
2. Fiesta del Trabajo : Sunday, 1 May, 1988 
3. Día de la Comunidad Valenciana : Sunday, 9 October, 1988 
4. Día de Navidad : Sunday, 25 December, 1988