underated explanation.

I struggled with this as well, but I think I have a decent answer.

In some cases, p0 * percent will yield something like 1200.2. In reality, we can never have .2 (20%) of a person, so we round down.

But importantly, this also holds true for cases where we have 95% of a person. A person is always a whole unit, and therefore a partial person (even 99.99% of a person) cannot exist.

Basically, because a partial of a person can't exist it is equivalent to 0 people, and therefore we always round down when we encounter this type of number.

Idk how much this explanation will make sense to anyone else, but it sorta clicks for me.

Because if you don't use it, you won't get the good result... (???)