During peak summer season, a whitewater rafting company charges a 15% registration fee to reserve a 6-person raft that
rents for $90. How much is the fee?

You have to pay the 90$ we all ready know it’s over 90. 15% of 90 is just 90x0.15 which is 13.50. So the fee (13.50) plus the cost(90) is 103.50$ total for the raft

The answer simplified would be. -6300x