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How many working days in year 1989?
Here is the detail of the calculation:
Because 1989 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 7 public holidays that do not fall during a weekend and we obtain 253 working days in 1989.
 Here is the list of these 7 public holidays: 
 
 1. Новы год : Monday, 2 January, 1989 
2. Мiжнародны жаночы дзень : Wednesday, 8 March, 1989 
3. Дзень працы : Monday, 1 May, 1989 
4. Радунiца : Tuesday, 9 May, 1989 
5. Дзень Незалежнасцi : Monday, 3 July, 1989 
6. Дзень Кастрычніцкай рэвалюцыі : Tuesday, 7 November, 1989 
7. Каляды каталiцкiя : Monday, 25 December, 1989 
And here are the 2 public holidays falling on a weekend:
1. Новы год : Sunday, 1 January, 1989 
2. Каляды праваслаўныя : Saturday, 7 January, 1989