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How many working days in year 2010?
Here is the detail of the calculation:
Because 2010 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 2010.
 Here is the list of these 10 public holidays: 
 
 1. Año Nuevo : Friday, 1 January, 2010 
2. Lunes de Carnaval : Monday, 15 February, 2010 
3. Martes de Carnaval : Tuesday, 16 February, 2010 
4. Viernes Santo : Friday, 2 April, 2010 
5. Día del Trabajo : Friday, 30 April, 2010 
6. Batalla de Pichincha : Monday, 24 May, 2010 
7. Primer Grito de la Independencia : Monday, 9 August, 2010 
8. Independencia de Guayaquil : Friday, 8 October, 2010 
9. Día de los Difuntos : Monday, 1 November, 2010 
10. Independencia de Cuenca : Friday, 5 November, 2010 
And here is the public holiday falling on a weekend:
1. Navidad : Saturday, 25 December, 2010