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How many working days in year 2091?
Here is the detail of the calculation:
Because 2091 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 7 public holidays that do not fall during a weekend and we obtain 254 working days in 2091.
 Here is the list of these 7 public holidays: 
 
 1. Uusaasta : Monday, 1 January, 2091 
2. Suur Reede : Friday, 6 April, 2091 
3. Kevadpüha : Tuesday, 1 May, 2091 
4. Taasiseseisvumispäev : Monday, 20 August, 2091 
5. Jõululaupäev : Monday, 24 December, 2091 
6. Esimene jõulupüha : Tuesday, 25 December, 2091 
7. Teine jõulupüha : Wednesday, 26 December, 2091 
And here are the 5 public holidays falling on a weekend:
1. Iseseisvuspäev : Saturday, 24 February, 2091 
2. Ülestõusmispühad : Sunday, 8 April, 2091 
3. Nelipühad : Sunday, 27 May, 2091 
4. Võidupüha : Saturday, 23 June, 2091 
5. Jaanipäev : Sunday, 24 June, 2091