I believe it's lvl-based. Since I've been making a few low lvl rep mules and the amount of Rep earned per lvl-up stayed stable regardless my sr. was lvl 9, 10 or 11, being 1480 Rep points for lvl-ups from 1 to 9, I believe.
EDIT: my bad, 1480 was Lvl 8, early %s. A char's total rep gain from lvl 1 through lvl 10 is approximately 2150. Increasing as the Jr's lvl gets higher. (lvl 1 ~> lvl 2 gives 110 Rep or so I believe)
EDIT: my bad, 1480 was Lvl 8, early %s. A char's total rep gain from lvl 1 through lvl 10 is approximately 2150. Increasing as the Jr's lvl gets higher. (lvl 1 ~> lvl 2 gives 110 Rep or so I believe)