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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 10 public holidays that do not fall during a weekend and we obtain 250 working days in 1989.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day (observance) : monday, january 2, 1989 
2. Martin Luther King Day : monday, january 16, 1989 
3. Washington's Birthday : monday, february 20, 1989 
4. Memorial Day : monday, may 29, 1989 
5. Independence Day : tuesday, july 4, 1989 
6. Labor Day : monday, september 4, 1989 
7. Columbus Day : monday, october 9, 1989 
8. Veterans Day (observance) : friday, november 10, 1989 
9. Thanksgiving : thursday, november 23, 1989 
10. Christmas : monday, december 25, 1989 
And here are the 2 public holidays falling on a weekend:
1. New Year's Day : sunday, january 1, 1989 
2. Veterans Day : saturday, november 11, 1989