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How many working days in year 1983?
Here is the detail of the calculation:
Because 1983 is not a leap year, it has 365 days.
Let's remove 53 saturdays and 52 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 1983.
 Here is the list of these 10 public holidays: 
 
 1. Martin Luther King Day : monday, january 17, 1983 
2. Washington's Birthday : monday, february 21, 1983 
3. Good Friday : friday, april 1, 1983 
4. Memorial Day : monday, may 30, 1983 
5. Juneteenth (observance) : monday, june 20, 1983 
6. Independence Day : monday, july 4, 1983 
7. Labor Day : monday, september 5, 1983 
8. Veterans Day : friday, november 11, 1983 
9. Thanksgiving : thursday, november 24, 1983 
10. Christmas (observance) : monday, december 26, 1983 
And here are the 3 public holidays falling on a weekend:
1. New Year's Day : saturday, january 1, 1983 
2. Juneteenth National Independence Day : sunday, june 19, 1983 
3. Christmas : sunday, december 25, 1983