The bit I like about this one is that it's also either wrong or highly misleading, depending on your viewpoint. If I have a row that says: "% of total" : 0.01

The bit I like about this one is that it's also either wrong or highly misleading, depending on your viewpoint. If I have a row that says: "% of total" : 0.01 I would not expect that to be 1%. At least, this could easily be the source of an inaccurate calculation elsewhere. This is not a major criticism, but perhaps would be a good point to introduce the idea of testing some of your code, even as a few simple cells that calculate things you expect.