I would like to have the option for late assignments to be able to take a certain percent off of the amount of points the student is receiving.  It is currently set up to take off whatever percent off the amount possible. 

For example, if I wanted to take 10% off for each day late and my I gave the student 88 out of 100, the setup currently is that it would subtract 10 points from that per day late so after 1 day that grade would receive a 78 or 2 days a 68 and so on.  I would like to be able to take off 10% from the 88 so in this example it would take off 8.8 per day so after 1 day it would be 79.2 and 2 days 70.4 and so on.

I feel like some teachers that use this probably aren't aware of how it is counting off.  Every teacher I talk to would like it to work the way that I'm asking.