Pre-tax profit on one of our card products dropped from 100 million to 80 million dollars this year, and your boss wants the root cause within a week. How would you break this problem down first?

我们一张信用卡产品今年税前利润从1亿美元掉到了8000万，老板让你一周内搞清楚原因。你第一步会怎么拆这个问题？