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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 11 public holidays that do not fall during a weekend and we obtain 249 working days in 1989.
 Here is the list of these 11 public holidays: 
 
 1. New Year's Day observance : Monday, 2 January, 1989 
2. Human Rights Day : Tuesday, 21 March, 1989 
3. Good Friday : Friday, 24 March, 1989 
4. Family Day : Monday, 27 March, 1989 
5. Freedom Day : Thursday, 27 April, 1989 
6. Workers' Day : Monday, 1 May, 1989 
7. Youth Day : Friday, 16 June, 1989 
8. National Women's Day : Wednesday, 9 August, 1989 
9. Heritage Day observance : Monday, 25 September, 1989 
10. Christmas Day : Monday, 25 December, 1989 
11. Day of Goodwill : Tuesday, 26 December, 1989 
And here are the 3 public holidays falling on a weekend:
1. New Year's Day : Sunday, 1 January, 1989 
2. Heritage Day : Sunday, 24 September, 1989 
3. Day of Reconciliation : Saturday, 16 December, 1989