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How many working days in year 2089?
Here is the detail of the calculation:
Because 2089 is not a leap year, it has 365 days.
Let's remove 53 saturdays and 52 sundays. It remains 260 days.
Now, let's remove 6 public holidays that do not fall during a weekend and we obtain 254 working days in 2089.
 Here is the list of these 6 public holidays: 
 
 1. Божић : Friday, 7 January, 2089 
2. Дан државности Србије : Tuesday, 15 February, 2089 
3. Дан после Дана државности Србије : Wednesday, 16 February, 2089 
4. Велики петак : Friday, 29 April, 2089 
5. Васкршњи понедељак : Monday, 2 May, 2089 
6. Дан примирја : Friday, 11 November, 2089 
And here are the 4 public holidays falling on a weekend:
1. Нова Година : Saturday, 1 January, 2089 
2. Празник после Нове Године : Sunday, 2 January, 2089 
3. Васкршња субота : Saturday, 30 April, 2089 
4. Васкрс : Sunday, 1 May, 2089