If 2 bags of rice cost 3 dollars what is the cost per bag of rice

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Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals