The max combo bonus is x10 exp, which you receive starting on the 100th correct question in the combo.
So that's the highest exp multiplier you can get. So now you just need to know what is the highest base exp, to be able calculate the highest total exp of a single question. Each level and type of question has a set base exp:
lv1: vocab = 6 pts, kanji = 7 pts
lv2: vocab = 7 pts, kanji = 8 pts
...
lv8: vocab = 13 pts, kanji = 14 pts.
So, level 8 kanji questions have the highest base exp (14 pts). With a combo over 100 you receive the maximum exp multiplier combo bonus. So 140 exp is the highest amount of exp you can get for answering a single question.
Hope that answers everything? ^^
April 14, 2016 at 4:31pm