To estimate the price of the 2018 Hyundai Elantra I4 2.0L GL (Mid) with 150,000 km mileage, I first considered the selling prices of similar cars. A 2016 Elantra I4 2.0L GL (Mid) with 185,000 km sold for 35,000 SAR in February 2024, and another 2016 model with 159,121 km sold for 35,500 SAR in September 2024. A 2018 Elantra I4 1.6L GL (Mid) with 208,000 km sold for 39,500 SAR in July 2023. The 2018 Elantra I4 2.0L GLS (Top) with 80,000 km sold for 50,000 SAR in May 2024, indicating a higher value for the top variant. A 2017 Elantra I4 2.0L GL (Mid) with 217,000 km sold for 35,000 SAR in May 2024. The listed price for a 2018 Elantra I4 2.0L GL (Mid) with 157,000 km was 40,000 SAR, but it was delisted, suggesting a lower actual selling price. Considering these data points, the 2018 model year, and the mileage, I estimate the market price to be slightly higher than the 2016 models but lower than the top variant 2018 model.