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How many working days in year 1987?
Here is the detail of the calculation:
Because 1987 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 1987.
 Here is the list of these 14 public holidays: 
 
 1. New Year's Day : Thursday, 1 January, 1987 
2. Coming of Age Day : Monday, 12 January, 1987 
3. Foundation Day : Wednesday, 11 February, 1987 
4. Vernal Equinox Day : Friday, 20 March, 1987 
5. Shōwa Day : Wednesday, 29 April, 1987 
6. Greenery Day : Monday, 4 May, 1987 
7. Children's Day : Tuesday, 5 May, 1987 
8. Marine Day : Monday, 20 July, 1987 
9. Respect-for-Aged Day : Monday, 21 September, 1987 
10. Autumnal Equinox Day : Wednesday, 23 September, 1987 
11. Health and Sports Day : Monday, 12 October, 1987 
12. Culture Day : Tuesday, 3 November, 1987 
13. Labor Thanksgiving Day : Monday, 23 November, 1987 
14. Emperor's Birthday : Wednesday, 23 December, 1987 
And here is the public holiday falling on a weekend:
1. Constitution Memorial Day : Sunday, 3 May, 1987