I started by looking at the selling prices of similar cars. The first car, a 2015 Mazda CX-9 V6 3.7L High+ (Mid) with 212000 km and in average condition, sold for 45500 SAR on 2024-03-05. The second car, a 2015 Mazda CX-9 V6 3.7L High+ Premium (Top) with 121000 km and in good condition, sold for 62000 SAR on 2023-06-12. The third car, a 2015 Mazda CX-9 V6 3.7L High+ Premium (Top) with 145600 km and in average condition, sold for 41500 SAR on 2024-09-12. Given the target car's mileage of 171000 km and good condition, it falls between the second and third cars in terms of condition and mileage. I also considered the listed prices of similar cars, which ranged from 35000 SAR to 60000 SAR, but these are generally higher than actual selling prices. The most relevant listed price was 53500 SAR for a car with the same mileage and variant. Considering all these factors, I estimated the market price accordingly.