This question provides an opportunity to show the employer your ability to commercially evaluate data and translate your findings into deliverable solutions. The best possible answer showcases an example in which you have made a real business difference by identifying problems and making value-added recommendations to decision-makers.

With this type of question, you can afford to spend more time going into the details of your work. The employer wants to see your capability in understanding business operations and where money is made and lost, so use real figures and focus on how your financial expertise played a part in driving improved profitability and efficiency.