I bet that loan shark grandma is doing some hard work, huh.

He is definitely not going to let him and Sasuke pay a total of ћ2,000,000, so he's going to blackmail the principal that word is going to get out unless he cuts the fine to ћ500,000 instead. That should be more than enough to repair the door and the gym. Anatomy dolls are cheap. Take it or leave it or next time he's tossing the principal to the gym after sunset to experience the hands for himself and he doesn't get the money.