a variety store ledger

Once upon a time I made up a ledger for our local variety store.
It's a wee store in a wee village and there was nothing particularly complicated about the owner's needs.
However, I've decided to stick it on my website.
Who knows? Maybe there's another wee variety store out there, in need of a simple-minded spreadsheet.

It looks like this:

The cells with the wee red tags have comments, like this:

There's an "Explain" sheet that looks like this:

>What's that PST and GST stuff?

I should mention that the wee variety store is in Ontario ... and them's the taxes.