To estimate the price of the 2021 BMW X7 xDrive 40i with 29000 km mileage, I considered several data points. First, I looked at the selling prices of similar cars. A 2022 BMW X7 xDrive 50i with 6000 km sold for SAR 232700 in January 2024, and a 2019 BMW X7 xDrive 50i with 95000 km sold for SAR 209000 in March 2024. These cars are of a higher variant (xDrive 50i) compared to the xDrive 40i, so their prices are likely higher. Next, I reviewed listed prices of similar cars. A 2021 BMW X7 xDrive 40i with 29000 km was listed for SAR 310000, and another 2021 model with 46000 km was listed for SAR 270000. A 2020 model with 35000 km was listed for SAR 294000. Considering the depreciation and the fact that listed prices are generally higher than selling prices, I adjusted the estimate accordingly. The 2021 model with similar mileage and specs listed for SAR 310000 is a good reference, but I adjusted downwards to reflect a more realistic market value.