I'm putting this to the mumsnet vote...
I review my prices each year before Term 4 (in NZ this is Oct. each year). I give 4 weeks notice of any rise - the week of your last lesson, plus there is two weeks holiday and then your lesson the next week. Parents pay for 10 weeks in advance.
To notify you of the fee increase would you rather have:
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A letter saying how much the new fee is and an invoice.
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A letter saying how much and justifying (rise in electricity, rates etc.) it and an invoice.
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Something else entirely.