List Price is the price in the List. If the cars are brand new in the List, then list price is the price of the brand new cars as shown on the List. Or, list price is price without discount yet.

If the list price is reduced by 15 percent, then the sale price now is 85 percent of the list price.

So, if x is the list price of the four-door model, then

85 percent of x = 8000

0.85x = 8000

x = 8000/0.85

x = $9411.76 ----------------answer.

If the list price were $9411.76, and you have to pay only $8000 because the car is a year old, then you can save

$9411.76 -$8000 = $1411.76 -------------answer.

(That is the same as the 15 percent reduction of the list price. That is

0.15 * $9411.76 = $1411.76)