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How many working days in year 2010?
Here is the detail of the calculation:
Because 2010 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 2010.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day : Friday, 1 January, 2010 
2. Australia Day : Tuesday, 26 January, 2010 
3. Labour Day : Monday, 1 March, 2010 
4. Good Friday : Friday, 2 April, 2010 
5. Easter Monday : Monday, 5 April, 2010 
6. Anzac Day observance : Monday, 26 April, 2010 
7. Western Australia Day : Monday, 7 June, 2010 
8. Queen's Birthday : Monday, 27 September, 2010 
9. Christmas Day Observance : Monday, 27 December, 2010 
10. Boxing Day Observance : Tuesday, 28 December, 2010 
And here are the 4 public holidays falling on a weekend:
1. Easter Sunday : Sunday, 4 April, 2010 
2. Anzac Day : Sunday, 25 April, 2010 
3. Christmas Day : Saturday, 25 December, 2010 
4. Boxing Day : Sunday, 26 December, 2010