A 4-column table with 4 rows. Column 1 is labeled f with entries 3, 5, 7, 9. Column 2 is labeled 15.5 + 12 f with blank entries. Column 3 is labeled c with blank entries. Column 4 is labeled (f, c) with blank entries. Gale thought that it would be fun to go to the carnival. The carnival cost $15.50 for the first person and $12.00 for each additional person.

Equation: c = 15.5 + 12f

c = cost

f = number of friends

If the input of the equation is 3, what is the output?