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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, january 2, 1989 
2. Martin Luther King Day : monday, january 16, 1989 
3. Susan B. Anthony Day : wednesday, february 15, 1989 
4. Memorial Day : monday, may 29, 1989 
5. Juneteenth National Independence Day : monday, june 19, 1989 
6. Independence Day : tuesday, july 4, 1989 
7. Labor Day : monday, september 4, 1989 
8. Columbus Day : monday, october 9, 1989 
9. Election Day : tuesday, november 7, 1989 
10. Thanksgiving : thursday, november 23, 1989 
11. Christmas : monday, december 25, 1989 
And here are the 3 public holidays falling on a weekend:
1. New Year's Day : sunday, january 1, 1989 
2. Christmas Eve : sunday, december 24, 1989 
3. New Year's Eve : sunday, december 31, 1989