Answer:
4 miss days per year 
Explanation:
Let the previous employees miss days be = x 
As given, miss days now are 75% less than previous
x - 75%x = 1/365 
0.25x = 1/365 
x = 1 / (365 x 0.25) 
x = 4/365 
So, average back then could have been 4 days per 365 days