To estimate the price of the 2017 GMC Terrain I4 2.4L SLE (FWD) (Base) with 313000 km mileage, I first looked at the selling prices of similar cars. The 2015 model with 204000 km sold for 21500 SAR, and the 2016 model with 179000 km sold for 30000 SAR. Another 2016 model with 190830 km sold for 32000 SAR. Given the higher mileage of the target car, I adjusted the price downwards. I also considered the listed prices: a 2017 model with the same mileage was listed for 38000 SAR, and a 2016 model with 246000 km was listed for 35000 SAR. These listed prices are generally higher than selling prices. Considering the depreciation and the higher mileage, I estimated the market price accordingly.