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When numbers are being presented being clear never hurts. Critical thinking isn’t a key skill a lot of the population has.

I’d assume this was per hour or possibly per shift. If they did a 4-5 hour shift in an evening etc. Best never to make assumptions in these cases though…

Critical thinking will hopefully both let you reject 4/day and the idea that one of the other answers is obvious and unambiguous. If the data is incomplete, treat it as incomplete.

There is this stupid tipping in the equation as well. It should be banned.

I'll ignore the slight on critical thinking and point you to this:

https://news.ycombinator.com/item?id=39394839

TLDR: 4 deliveries does not make the "per hour" derivable by critical thinking without further data.