To estimate the price of the 2017 Chevrolet Cruze I4 1.8L LS (Base) with 121,000 km mileage, I first considered the selling prices of similar cars. A 2017 Cruze LS (Base) with 138,000 km sold for SAR 20,000 on 2024-09-13, which is very close in variant and condition. Another 2017 Cruze LS (Base) with 197,000 km sold for SAR 14,000 on 2024-05-16, indicating a lower price due to higher mileage. A 2017 Cruze LS (Base) with 39,000 km sold for SAR 26,000 on 2024-04-30, showing a higher price due to lower mileage. The listed price of a similar car with 138,000 km was SAR 22,000, but it was delisted, suggesting it might not have sold at that price. Considering these data points, the selling price of SAR 20,000 for a similar car with slightly higher mileage is the most relevant. Adjusting slightly for the lower mileage of the target car, I estimate the market price to be slightly higher than SAR 20,000.