simple...

Take the 80k, half it, take 40k invest it take the other 40k and open a karate school.

Karate schools now a day do some crazy money. The one I manage and I am a partner of easly does 30k a month with less than 10k in overhead. Some schools around the nation do 80k a month on a 20k overhead.

Then once you get the staff trained you can kick back and not do anything. Show up teach a couple of classes and then leave.

That's how i plan to retire at 30, lol