To estimate the price of the 2021 Chevrolet Spark I4 1.4L LT (Base) with 57300 km mileage in average condition, I first looked at the selling prices of similar cars. The 2019 model with 120500 km sold for 26000 SAR, the 2020 model with 34000 km sold for 31500 SAR, and another 2020 model with 94000 km sold for 26250 SAR. Given the average condition and mileage of the target car, it is reasonable to place its value between these figures. Next, I considered the listed prices of similar 2021 models, which ranged from 28000 SAR to 37000 SAR. The most relevant listings for cars with similar mileage (57300 km) were around 37000 SAR, but these are listed prices and typically higher than selling prices. Considering the depreciation and the actual selling prices of older models, I adjusted the estimate downwards from the listed prices to reflect a more accurate market value.