**Solution:**

The total amount T, in dollars, Salim will pay for n tickets is given by T=15n+12, which consists of both a per-ticket charge and a one-time service fee. Since n represents the number of tickets that Salim purchases, it follows that 15n represents the price, in dollars, of n tickets. Therefore, 15 must represent the per-ticket charge. At the same time, no matter how many tickets Salim purchases, he will be charged the 12 dollars fee only once. Therefore, 12 must represent the amount of the service fee, in dollars.

Choice A is incorrect. Since n represents the total number of tickets that Salim purchases, it follows that 15n represents the price, in dollars, of n tickets, excluding the service fee.Therefore, 15, not 12, must represent the price of 1 ticket. Choice C is incorrect. If Salim purchases only 1 ticket, the total amount, in dollars, Salim will pay can be found by substitutingn=1 into the equation for T. If n=1,T=15(1)+12=27. Therefore, the total amount Salim will pay for one ticket is 27,not12. Choice D is incorrect. The total amount, in dollars, Salim will pay for n tickets is given by 15n+12. The value 12 represents only a portion of this total amount. Therefore, the value 12 does not represent the total amount, in dollars, for any number of tickets.

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