This can be a tough question that will put you on the spot. When responding be polite, diplomatic and give a good business related answer.

☛ I can't really give you a accurate answer because at this time I don't know the scope of the job, it's responsibilities, hours etc.

☛ The job I perform, the salary I receive and the circumstances at my current company are not really comparable to the opportunity we are discussing today. However when I consider my skill sets, academic qualifications and work experience.