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How many working days in year 2011?
Here is the detail of the calculation:
Because 2011 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 2011.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day Observance : Monday, 3 January, 2011 
2. Australia Day : Wednesday, 26 January, 2011 
3. Labour Day : Monday, 14 March, 2011 
4. Good Friday : Friday, 22 April, 2011 
5. Easter Monday : Monday, 25 April, 2011 
6. Additional public holiday because Anzac day falling on week end : Tuesday, 26 April, 2011 
7. King's Birthday : Monday, 13 June, 2011 
8. Melbourne Cup : Tuesday, 1 November, 2011 
9. Christmas Day Observance : Monday, 26 December, 2011 
10. Boxing Day Observance : Tuesday, 27 December, 2011 
And here are the 4 public holidays falling on a weekend:
1. New Year's Day : Saturday, 1 January, 2011 
2. Easter Saturday : Saturday, 23 April, 2011 
3. Easter Sunday : Sunday, 24 April, 2011 
4. Christmas Day : Sunday, 25 December, 2011