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How many working days in year 1978?
Here is the detail of the calculation:
Because 1978 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 4 public holidays that do not fall during a weekend and we obtain 256 working days in 1978.
 Here is the list of these 4 public holidays: 
 
 1. Good Friday : Friday, 24 March, 1978 
2. Labour Day : Monday, 1 May, 1978 
3. National Day : Wednesday, 9 August, 1978 
4. Christmas Day : Monday, 25 December, 1978 
And here is the public holiday falling on a weekend:
1. New Year's Day : Sunday, 1 January, 1978