$1,000
This is because since the car is $3,000 and it's newer it's worth more, so the logical answer is 1,000 because the price of car would have had to go down a specific amount each year ($500)
Years:
1 - $3,500 (assuming)
2- $3,000
3- $2,500 (If goes down by 500 each year)
4- $2,000
5- $1,500
6- $1,000 (We end up with 1,000 correctly)