This is overly expository and could be much shorter. It also shows the programmer had no interested in actually understanding what their code was doing. The comment makes absolutely no sense whatsoever. "It needs the 4th time". What needs it? I absolutely guarantee you you do not need to loop 4 times to "calculate the difference from the sales tax". "Weird, I know" -- I guarantee you it's not weird if you actually understand anything about the calculation you're supposed to be implementing. This comment barely passes as an English sentence, much less someone who knows anything about taxes would ever say. This is such a great example of an absolutely terrible comment belying lazy, thoughtless programming.

I'm not sure I've seen all the "comment everything" advocates in this thread provide a single example of a good comment.