If someone accepts your answer to their question you get 20 points. 🙂
How to earn Karma on Answers
You gain or lose karma on Answers by posting and voting. The following are the current karma rules:
if someone upvotes an answer, question, or app review you posted, you gain 15 points for each vote, up to 200/day. if someone downvotes an answer, question, or app review you posted, you lose 5 points. if you downvote someone's question, answer, app posting, or app review, you lose/spend 1 point to do so. if one of your answers is accepted, you gain 20 points. if you accept an answer someone posted to your question, you gain 2 points.