I started by looking at the selling prices of similar cars. The most relevant data point is the 2018 Nissan Sentra I4 1.6L S (Base) with 182000 km sold for 31500 SAR on 2024-07-28. This car is very similar to the target car in terms of year, engine, variant, and condition. Another relevant data point is the 2020 Nissan Sentra I4 1.6L S (Base) with 49000 km sold for 40000 SAR on 2024-07-24, but this car is newer and in better condition, so it is less comparable. The 2016 Nissan Sentra I4 1.6L SL with 211000 km sold for 25000 SAR on 2024-07-18, but it is older and a different variant. For listed prices, the 2018 Nissan Sentra I4 1.6L S (Base) with 182000 km is listed for 28000 SAR, which is lower than the selling price of a similar car. Considering the selling price of 31500 SAR and the listed price of 28000 SAR, I estimate the market price of the target car to be slightly lower than the selling price but higher than the listed price.