Actually, it's not. Since every complete bar is 200 HP, you can simply measure the length of the given bar, and reduce it to the correct value by using the properties of multiplcation/division (ratios and proportion). Application of in-game knowledge runs along the lines of appreciation. I can't do major plot questions yet, because apparently, people in Europe don't have the game.

If you wanted a rigged question, I would ask you to determine the percentage of dropped items for a 2% dropped item with seven Lucky Luckys equipped, since I don't feel like doing diminishing returns, or math, you could do it for me.

The answer was A.

Fastest Finger Question!
Put these Characters in alphabetical order.
Ascending/descending doesn't matter.

A) Xemnas
B) Xigbar
C) Axel
D) Demyx