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How many working days in year 2015?
Here is the detail of the calculation:
Because 2015 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 14 public holidays that do not fall during a weekend and we obtain 247 working days in 2015.
 Here is the list of these 14 public holidays: 
 
 1. New Year's Day : Thursday, January 1, 2015 
2. Martin Luther King Day : Monday, January 19, 2015 
3. Good Friday : Friday, April 3, 2015 
4. Memorial Day : Monday, May 25, 2015 
5. Juneteenth National Independence Day : Friday, June 19, 2015 
6. Independence Day (observance) : Friday, July 3, 2015 
7. Labor Day : Monday, September 7, 2015 
8. Columbus Day : Monday, October 12, 2015 
9. Election Day : Tuesday, November 3, 2015 
10. Veterans Day : Wednesday, November 11, 2015 
11. Thanksgiving : Thursday, November 26, 2015 
12. Black Friday : Friday, November 27, 2015 
13. Christmas Eve : Thursday, December 24, 2015 
14. Christmas : Friday, December 25, 2015 
And here is the public holiday falling on a weekend:
1. Independence Day : Saturday, July 4, 2015