Yeah, thinking about it in terms of how much total you get, rather than how much additional you get, you can always pick some minimum and maximum and make a linear function to fit. (Though you want minimum<maximum, obviously...) Then you can subtract off x to get the entitlement part. Of course at the maximum the entitlement is always 0.
The article proposal is between 0 and x/2 (not that it changes much).
Yeah, thinking about it in terms of how much total you get, rather than how much additional you get, you can always pick some minimum and maximum and make a linear function to fit. (Though you want minimum<maximum, obviously...) Then you can subtract off x to get the entitlement part. Of course at the maximum the entitlement is always 0.