To estimate the price of the 2017 GMC Terrain I4 2.4L SLE (FWD) (Base) with 131000 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. Given the 2017 model is newer and has lower mileage, it should be valued higher. Next, I considered the listed prices of similar cars. The 2017 model with the same mileage is listed for 44000 SAR, but listed prices are generally higher than selling prices. Other 2016 models with similar mileage are listed between 33000 and 37000 SAR. Considering the condition and the fact that the car is in good condition, I adjusted the price slightly higher than the 2016 models but lower than the listed price for the 2017 model.