Do you know how many Jews it take to change a lightbulb? Depends, what's in it for them?
I'm confused. Are you trying to offend Jewish people?
It's not an offensive question.
The wording of your statement suggests that you think that Jewish people in particular will not do simple favors unless they are rewarded, and this perpetuates an unfair stereotype. I'm sure that if you ask a Jewish acquaintance, or even a stranger, for help with a simple task, they would help you without hesitation.
I was saying it's offensive to ask this question in general and not just about Jews because you can put any race in that question.
But the race that gets the stereotype tends to be the Jewish race. And it is used to make them seem like people should not have sympathy for them because they are greedy people.