This should be upvoted! Comment section more than often hints toward the solution.

Hi there, make sure you floor the population each time it is calculated. Hope this helps:)

rounded to two decimal places.

It means it can have two decimal places, your code returns integers instead.

This is not the proper way to raise an issue. You must prove there is actually an issue. Which tests don't make sense, and why?

That can depend a lot upon the language you're using.

Also, please stop complaining about kata ranks being off by one ( not you specifically, just everyone ). Changing ranks is expensive, not worth it, and not going to happen. Just enjoy the cheap points.

It's a pretty easy kata, isn't it? It went through beta and received its rating over 8 years ago. I don't think it's something that can be adjusted.

Because the edge case with 16 bumps isn't tested.

No, the tests is fine.