"0 apple" isn't conventional English usage. In Russian useage I understand that there are three plural cases - perhaps you could redo the user interface in Russian? :)

Not sure I noticed "more appropriate units", not to the point of objecting anyway. More comment concerning units was a "more than one way to use it" type comment. I'll likely change my version to insert comas however to make the numbers more readable. Perhaps we need to add a configuration menu?

I use Tk in a fairly light weight way fairly often for simple GUI apps such as this. I guess I didn't spend much more than an hour on the original code before I posted it - post early and often they say.