The answer is $492.13 Multiply 455 x .04 Then, add that answer(18.2) to 455 Then, use that sum(473.2) and multiply it by .04 Then, add that(18.928) to to your first answer(473.2) for the final answer which is 492.128 which is rounded to $492.13
This is a trick question. It says that Shelby wants to go with THREE other friends and implies that she is going too. So that means there are 4 people going. Hence, do 25.25*4=101.