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How many working days in year 1990?
Here is the detail of the calculation:
Because 1990 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 15 public holidays that do not fall during a weekend and we obtain 246 working days in 1990.
 Here is the list of these 15 public holidays: 
 
 1. Año Nuevo : Monday, 1 January, 1990 
2. Lunes de Carnaval : Monday, 26 February, 1990 
3. Martes de Carnaval : Tuesday, 27 February, 1990 
4. Jueves Santo : Thursday, 12 April, 1990 
5. Viernes Santo : Friday, 13 April, 1990 
6. Declaración de la Independencia : Thursday, 19 April, 1990 
7. Día Internacional de los Trabajadores : Tuesday, 1 May, 1990 
8. Celebración de la constitución de un primer gobierno dentro del proceso de independencia nacional iniciado en la Revolución de Mayo. : Friday, 25 May, 1990 
9. Día de San Pedro y San Pablo : Friday, 29 June, 1990 
10. Conmemora de la Declaración de independencia nacional de Venezuela (5 de julio de 1811) : Thursday, 5 July, 1990 
11. Natalicio del libertador Simón Bolívar : Tuesday, 24 July, 1990 
12. Día de la Resistencia Indígena : Friday, 12 October, 1990 
13. Nochebuena : Monday, 24 December, 1990 
14. Navidad : Tuesday, 25 December, 1990 
15. Nochevieja : Monday, 31 December, 1990 
And here is the public holiday falling on a weekend:
1. Batalla de Carabobo : Sunday, 24 June, 1990