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The right formula is:

- The fixed amount (the money we have to pay, no matter how many boats are hired) is 15 euros.

- The number of boats we hire, we call b. (DON'T USE CAPITALS!!)

- Every boat costs 5 euros.

- The total cost for the trip we call c.

A

c = 15b + 5

B

15 + 5b = c

C

c = 15 + 5b

D

b = 15c + 5