net price
Words meaning does not pay might be:
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It is worth as much as someone will pay for it
Something Steve Jobs wants you to pay extra for after you by an older iPod.
It depends on what it is. If it's something that makes the apartment unlivable, the landlord is responsible to make the repair. If you're looking for something that is considered cosmetic, then you can get permission from the landlord to do it yourself. Try to negotiate with him to pay part of the cost.
It depends on how it broke. If you or your guest/visitor broke something you must pay for it. If it broke because of normal wear and tear then you're not responsible.
If your instructor is close with you/likes you and is free to go with you to nationals, I wouldn't pay myself since as I do I assume you already pay for the classes and to be a member at his/her organization/business. However, what I would do and what I would suggest you do is give him/her a thank you gift. You know like a gift cardtk a restaurant or something like that.