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How many working days in year 2051?
Here is the detail of the calculation:
Because 2051 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 250 working days in 2051.
 Here is the list of these 10 public holidays: 
 
 1. Нова година : Monday, 2 January, 2051 
2. Национален ден : Friday, 3 March, 2051 
3. Ден на труда : Monday, 1 May, 2051 
4. Православни Велики петък : Friday, 5 May, 2051 
5. Православни Велики понеделник : Monday, 8 May, 2051 
6. Ден на културата и славянската писменост : Wednesday, 24 May, 2051 
7. Ден на съединението : Wednesday, 6 September, 2051 
8. Ден на независимостта : Friday, 22 September, 2051 
9. Коледа : Monday, 25 December, 2051 
10. Втори ден на Коледа : Tuesday, 26 December, 2051 
And here are the 4 public holidays falling on a weekend:
1. Нова година : Sunday, 1 January, 2051 
2. Православна Велика събота : Saturday, 6 May, 2051 
3. Православен Великден : Sunday, 7 May, 2051 
4. Бъдни вечер : Sunday, 24 December, 2051