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How many working days in year 1960?
Here is the detail of the calculation:
Because 1960 is a leap year, it has 366 days.
Let's remove 53 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1960.
 Here is the list of these 9 public holidays: 
 
 1. Nowy Rok : Friday, 1 January, 1960 
2. Święto Trzech Króli : Wednesday, 6 January, 1960 
3. Poniedziałek Wielkanocny : Monday, 18 April, 1960 
4. Święto Konstytucji : Tuesday, 3 May, 1960 
5. Boże Ciało : Thursday, 16 June, 1960 
6. Wniebowzięcie Najświętszej Maryi Panny : Monday, 15 August, 1960 
7. Wszystkich Świętych : Tuesday, 1 November, 1960 
8. Dzień Niepodległości : Friday, 11 November, 1960 
9. Drugi dzień Bożego Narodzenia : Monday, 26 December, 1960 
And here are the 4 public holidays falling on a weekend:
1. Niedziela Wielkanocna : Sunday, 17 April, 1960 
2. Święto Pracy : Sunday, 1 May, 1960 
3. Zielone Świątki : Sunday, 5 June, 1960 
4. Pierwszy dzień Bożego Narodzenia : Sunday, 25 December, 1960