What have you done at your previous job to reduce costs or save time?

"My last role was bookkeeper for a small, established company. However, my predecessor did not have established procedures in place and it sounded like he had made constant mistakes. One of the first things I did when I started was I made a monthly checklist that detailed all the steps I took during the monthly close. Included in these steps were 'checks' I performed to self-review my work. The checklist served as a cover sheet that I would hand off to my manager so she would know exactly what steps I completed. This led to increased efficiency, as we estimated it saved 4-6 hours a month in error corrections."