Math 157

There are 2 questions

I don't know why the answer is wrong...

can you provide some detailted process?

thx

A boat company will plan a group trip from Vancouver, B.C., to Savary Island, B.C., for groups of 20 or larger. If the group is exactly 20, the cost is $ 80 per person. The company offers to discount each person's ticket by 5 dollars for each addition above 20. IFX is the number of additional people above 20, then the revenue is given by 12(1): (number of people) - {ticket price} = { x V }- ( {80+5 ))