What are bonus xp points based on?

Question

What are bonus xp points in challenges based on?

Answer 1

if your xp in the challenge language is low then you get a bonus for every correct answer

Answer 2

On a difference in xp in challenge weapon between you and your adversary.

Answer 3

No more bonus xp in most of weapons, I see only in c++, don't know what is Sololearn's policy and the xp system they are following newly ..

Answer 4

We still get bonus xp for challenges don't we?