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How many working days in year 2099?
Here is the detail of the calculation:
Because 2099 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 2099.
 Here is the list of these 8 public holidays: 
 
 1. Første nyttårsdag : Thursday, 1 January, 2099 
2. Skjærtorsdag : Thursday, 9 April, 2099 
3. Langfredag : Friday, 10 April, 2099 
4. Andre påskedag : Monday, 13 April, 2099 
5. Første mai : Friday, 1 May, 2099 
6. Kristi Himmelfartsdag : Thursday, 21 May, 2099 
7. Andre pinsedag : Monday, 1 June, 2099 
8. Første Juledag : Friday, 25 December, 2099 
And here are the 4 public holidays falling on a weekend:
1. Første påskedag : Sunday, 12 April, 2099 
2. Grunnlovsdagen : Sunday, 17 May, 2099 
3. Første pinsedag : Sunday, 31 May, 2099 
4. Andre Juledag : Saturday, 26 December, 2099