The student council is organizing a trip to a rock concert. All proceeds from ticket sales will be donated to a charity. Tickets to the concert cost $31.25 per person if a minimum of 104 people attend. For every 8 extra people that attend, the price will decrease by $1.25 per person.
a). How many tickets need to be sold to maximize the donation to charity?
b). What is the price of each ticket that maximizes the donation?
c). What is the maximum donation?

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