Start off by explaining the math to the interviewer. You might say something like this, "I would count upwards from 23.51 to 100 to gather the correct change. 23.51 76 would be 99.51 49 cents would equal 100. So, I would give the customer 76.49" Next, share how to correctly hand the change to the customer. A best practice is to always hand the customer their change first, and place the cash on top. Think about those times you have received coins on top of cash; it's hard to handle! Placing the coins below the cash makes it much easier for the customer to quickly and efficiently put the change away.