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Miguel and his family are on vacation and notice an advertisement for a taxi service that charges a fee of $12 to pick up a family and an additional fee of $0.55 per mile for the trip. Write an equation that models this situation, using m to represent the number of miles traveled and t to represent the total cost for the trip. Find the total cost of an 18 mile trip.

A. t=0.55m+12; $21.90
B. t=12m+0.55; $21.90
C. t=0.55+ m+12; $30.55
D. t=0.5512+m; $24.60