I started by looking at the selling prices of similar cars. The 2021 GAC GS8 GL 4WD (Mid) with 19260 km sold for 77000 SAR on 2023-09-08. This car is newer and has lower mileage, so it should be priced higher than the target car. The 2020 GAC GS8 GT 4WD (Top) with 120000 km sold for 63500 SAR on 2023-11-26, and another 2020 GT 4WD (Top) with 125000 km sold for 54000 SAR on 2024-06-09. These cars have higher mileage and are a higher trim, so they should be priced lower than the target car. The 2020 GT 4WD (Top) with 56771 km sold for 60000 SAR on 2024-06-27, which is closer in condition but still a higher trim. The listed price for a 2019 GL 4WD (Mid) with 85000 km is 57500 SAR, which is a good reference point. Considering the target car's mileage, condition, and trim, I estimate the market price to be slightly lower than the listed price but higher than the lower trim sold prices.