Calculating an Average Markup

Question

We are trying to find the average markup per bill.

Would you take the totals at the end of the dataset to find the markup? Or would you find the individual markup of each biill and then take an average of that?

Answer 1

I would use the totals; add, divide.

This wont give an exact % because you don't know what was sold.

You can also do it piece by piece.