The table shows the cost in dollars, y, for renting a truck and the discount for using personal insurance for x number of days.
Number of Days, x
1
Cost for Truck
Rental, y
($)
47.50
82.50
117.50
152.50
Discount for Personal
Insurance, y
($)
7.50
15.00
22.50
30.00
2
4
Which function shows the final cost in dollars, y, for renting four trucks using personal insurance for x number of days?