I should put every bill on a single pile.

When handling money: - Don't do anything in a hurry; - Take it easy and organize the cash register well by placing the bills and coins correctly; - Try to keep up the pace. Using these tips will improve your time, prevent providing the wrong change, avoid lots of misunderstandings, and make the whole process easier.

Source: Work - How to Give Back Correct Change https://work.chron.com/give-back-correct-change-22049.html

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