Mistakes happen. Unfortunately, they can cost you out of pocket, depending on the rules of your bar. Those busy nights can be chaotic, and you could make a mistake when counting money and offering change, only because you are moving so quickly. The interviewer wants to know that if you make a mistake, you own up to it and correct it. Explain your thought process in addressing a situation like this and show them how you have proven yourself reliable and trustworthy in the past.
"If my drawer was short, I would recount a couple of times to make sure the amount is accurate. Then I would check credit card slips and search the cash drawer to see if anything slipped through the cracks. I would try to find out why it happened first. Immediately, I would take the $44.21 out of my tips. For the long-term solution, I would pay closer attention to my cash paying customers."
"I certainly hope this wouldn't happen because I would hate to lose out on taking that cash home in tips! If my drawer were short, I would first recount, check under the drawer, and then ensure I didn't mistake a cash receipt as a credit card receipt. I would ask a coworker to recount as well if someone were available."
"I haven't been short in my cash out for many months. I like to take home every dollar that I earn, so I am extra diligent when it comes to balancing my drawer, taking cash, and giving change."