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How many working days in year 1940?
Here is the detail of the calculation:
Because 1940 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 252 working days in 1940.
 Here is the list of these 10 public holidays: 
 
 1. Første nyttårsdag : Monday, 1 January, 1940 
2. Skjærtorsdag : Thursday, 21 March, 1940 
3. Langfredag : Friday, 22 March, 1940 
4. Andre påskedag : Monday, 25 March, 1940 
5. Første mai : Wednesday, 1 May, 1940 
6. Kristi Himmelfartsdag : Thursday, 2 May, 1940 
7. Andre pinsedag : Monday, 13 May, 1940 
8. Grunnlovsdagen : Friday, 17 May, 1940 
9. Første Juledag : Wednesday, 25 December, 1940 
10. Andre Juledag : Thursday, 26 December, 1940 
And here are the 2 public holidays falling on a weekend:
1. Første påskedag : Sunday, 24 March, 1940 
2. Første pinsedag : Sunday, 12 May, 1940