When assigning a late penalty for assignments, is that penalty subtracted from the total or does it reduce the student's score by that percentage.
Ex: Assignment is worth 10 points and the late penalty is 20%
Student A hands it in late, getting all questions correct (base score of 10); they get 80% in either circumstance
Student B hands it in late, getting half of the questions correct (base score of 5); do they get 3/10 (subtract 20% of the total from their score) or do they get 4/10 (reduce their score by 20% of it's original value)?
Student C hands it in late, getting only 1 question right (base score of 1); do they get -1/10, 0/10, or 0.8/10?
Which is the most reasonable late penalty? Or at least which one has better outcomes?