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How many working days in year 1987?
Here is the detail of the calculation:
Because 1987 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 1987.
 Here is the list of these 15 public holidays: 
 
 1. Año Nuevo : Thursday, 1 January, 1987 
2. Lunes de Carnaval : Monday, 2 March, 1987 
3. Martes de Carnaval : Tuesday, 3 March, 1987 
4. Día Nacional de la Memoria por la Verdad y la Justicia : Tuesday, 24 March, 1987 
5. Día del Veterano y de los Caídos en la Guerra de Malvinas : Thursday, 2 April, 1987 
6. Jueves Santo : Thursday, 16 April, 1987 
7. Viernes Santo : Friday, 17 April, 1987 
8. Día Internacional de los Trabajadores : Friday, 1 May, 1987 
9. Día de la Revolución de Mayo : Monday, 25 May, 1987 
10. Día de la Independencia : Thursday, 9 July, 1987 
11. Día del Paso a la Inmortalidad del General José de San Martín : Monday, 17 August, 1987 
12. Día del Respeto a la Diversidad Cultural : Monday, 12 October, 1987 
13. Día de la Soberanía Nacional : Monday, 23 November, 1987 
14. Día de la Inmaculada Concepción : Tuesday, 8 December, 1987 
15. Navidad : Friday, 25 December, 1987 
And here is the public holiday falling on a weekend:
1. Conmemoración de la muerte del General Manuel Belgrano : Saturday, 20 June, 1987