So, this is a photograph that someone took on the internet of a real world receipt from a restaurant somewhere I think in the UK and I think the take away will perhaps be cleared pretty fast.
So, it looks like the curry and some other items were really precisely defined in terms of price and this is of course has generated this receipt - by some computer, some cash-- cash register and they just didn't account for the inherent imprecision so here is a perhaps real world incarnation of that.