Ok I was thinking about avgas I must admit Only realised it after my mistake was pointed out...and Big Mac meals as opposed to a burger...but the basic premise still holds true.
Still by your calcs they are paying AU$2.50 odd/liter for petrol....nearly double what it costs in Oz. That is not correct either.
It is rediculous to use exchange rates to compare wages across the world and then proclaim Jetstar are underpaid without looking at relative costs of living.