The problem statement is missing a lot of information, so we'll make some assumptions:
1. The dealer's cost is the cost of manufacture: $12,500.
2. The marked-up price is
$12,500 + 0.67×12,500 = $20,875.
3. The book value after 8 years is
$20,875 - 0.57×20,875 = $8976.25
So, the Craigslist price is
0.60×$8976.25 = $5385.75