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The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

I’m stuck on this equation, anyone got the answer?