Imagine being on the job and a man comes into the store a second time to complain that he was double charged for a bag of chips. He feels scammed and wants his money back immediately. How would you handle it? This is the kind of question you will get in your interview. A good answer might be that you would go ahead and refund him the money to keep him as a customer since it was a small purchase. You might say you’d grab a supervisor for assistance. You might also mention that watching the sales screen during each checkout keeps you from making many of those mistakes. This kind of answer shows that you can handle irate customers professionally and that you want to prevent the problem in the first place.