When ordering pizza from a certain pizza parlor, the delivery time is an exponential random variable with mean 25 minutes. If it takes more than 30 minutes for the pizza to be delivered, they provide it for free. If it takes more than 40 minutes, not only will the customer get the pizza for free, but he or she will receive an additional $10. If a pizza with delivery costs $18, on average, how much does the parlor make per pizza delivery?
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