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How many working days in year 1980?
Here is the detail of the calculation:
Because 1980 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 11 public holidays that do not fall during a weekend and we obtain 251 working days in 1980.
 Here is the list of these 11 public holidays: 
 
 1. New Year's Day : Tuesday, 1 January, 1980 
2. Human Rights Day : Friday, 21 March, 1980 
3. Good Friday : Friday, 4 April, 1980 
4. Family Day : Monday, 7 April, 1980 
5. Freedom Day observance : Monday, 28 April, 1980 
6. Workers' Day : Thursday, 1 May, 1980 
7. Youth Day : Monday, 16 June, 1980 
8. Heritage Day : Wednesday, 24 September, 1980 
9. Day of Reconciliation : Tuesday, 16 December, 1980 
10. Christmas Day : Thursday, 25 December, 1980 
11. Day of Goodwill : Friday, 26 December, 1980 
And here are the 2 public holidays falling on a weekend:
1. Freedom Day : Sunday, 27 April, 1980 
2. National Women's Day : Saturday, 9 August, 1980