**Background:**

My clients get credit card statements every year. He wants me to find out that whether the Bank is going fair calculation or not.

**Question**: Is there any quick and accurate way to do the job? Currently, I am worried because - first, if I do it manually it will a lot of time and secondly, there are chances of human errors.

Information from the comments:

* I have 5y x 12m = 60 statements in front of me.