> that I've repeated to you 3 times now

I explained how to deal with that.

BTW, crooks have stolen millions of dollars by adjusting software to shave off a penny here and there. The idea that McDonalds can afford to be unaware of a missing penny in a transaction, when they have billions of those transactions, is wrong.

In accounting software, it's critical to be accurate to the penny. Having the POS software be off by a penny calls into question the entire reliability of the software. Especially when normal accounting controls are not followed and the penny error is not detected.

I once read a story where a prospective engineering hire was given a plant tour at Ford. He noticed an inefficiency that was costing Ford 5 cents per car. He was promptly hired.

Edit:

> rockets trajectory or a an MRI scanner

I've heard the same arguments from people who vigorously insist that it's correct for rockets and scanners for the software to ignore bugs and soldier on. I hope the people who do write that software do not agree with those arguments. I suggest that re-evaluating this merits an investment of your time.