I started by looking at the selling prices of similar cars. The most relevant data points are: a 2012 GMC Acadia SLE2 (FWD) with 235000 km sold for 24000 SAR in good condition, a 2012 GMC Acadia SLE2 (FWD) with 186500 km sold for 20000 SAR in average condition, and a 2012 GMC Acadia SLE2 (FWD) with 116000 km sold for 20500 SAR in average condition. The target car has 239435 km and is in average condition, so it should be priced lower than the 24000 SAR car in good condition but close to the 20000 SAR car in average condition. Considering the higher mileage and average condition, I estimate the price to be slightly lower than 20000 SAR. The listed prices of similar cars range from 21500 to 28000 SAR, but these are generally higher than actual selling prices. Therefore, I adjusted the estimate accordingly.