What people think of as "significant" varies from human to human, but when developing your heuristic keep these things in mind:

Sweden has 1, 5, and 10kr coins; and bills for 20, 50, and 100kr; although the 50 isn't used very often.

One thing to note is that as the bill gets more expensive, the idea of what is "siginificant" for rounding up changes.

This is equivalent to not providing any clear specs: what is the cutoff point between the next round-up interval? The kata expects this:

bill < 100: 10
bill < 1000: 20
otherwise: 100

But it could easily be the total bill with 5% accounted for, since that'd be the actual least paid amount.

Again, this information is crucial to solving the kata but is being intentionally held back.

JS: You can still use regex

no random tests

There're already several katas about BFS tree-traversal.

Duplicate to lots of katas.

Duplicate of an older, approved kata.

Duplicate to at least 10 kata

I added random tests to this kata, please refer to me if something is broken.
If everything is fine i think this kata is valid for approval.

Only string arguments to split allowed

The description says nothing about this, and this "limitation" can be easily bypassed.

Need random tests

• More comprehensive tests?
• Random tests?