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How many working days in year 2040?
Here is the detail of the calculation:
Because 2040 is a leap year, it has 366 days.
Let's remove 52 saturdays and 53 sundays. It remains 261 days.
Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 251 working days in 2040.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day (observance) : Monday, January 2, 2040 
2. Martin Luther King Day : Monday, January 16, 2040 
3. Washington's Birthday : Monday, February 20, 2040 
4. Memorial Day : Monday, May 28, 2040 
5. Juneteenth National Independence Day : Tuesday, June 19, 2040 
6. Independence Day : Wednesday, July 4, 2040 
7. Labor Day : Monday, September 3, 2040 
8. Veterans Day (observance) : Monday, November 12, 2040 
9. Thanksgiving : Thursday, November 22, 2040 
10. Christmas : Tuesday, December 25, 2040 
And here are the 2 public holidays falling on a weekend:
1. New Year's Day : Sunday, January 1, 2040 
2. Veterans Day : Sunday, November 11, 2040