To estimate the price of the 2021 Changan Alsvin I4 1.5L Advanced (Top) with 117500 km mileage and average condition, I considered the following data points: 1. A 2023 Changan Alsvin I4 1.5L Advanced (Top) with 40000 km sold for 31000 SAR on 2024-01-17. 2. A 2022 Changan Alsvin I4 1.5L Advanced (Top) with 44000 km sold for 27500 SAR on 2024-04-14. 3. A 2022 Changan Alsvin I4 1.5L Advanced (Top) with 105000 km sold for 26000 SAR on 2024-04-26. 4. A 2022 Changan Alsvin I4 1.5L Advanced (Top) with 84000 km sold for 25500 SAR on 2024-06-20. 5. A 2022 Changan Alsvin I4 1.5L Advanced (Top) with 90000 km sold for 26000 SAR on 2024-08-10. 6. A 2022 Changan Alsvin I4 1.5L Advanced (Top) with 110400 km sold for 25500 SAR on 2024-08-29. 7. A 2022 Changan Alsvin I4 1.5L Advanced (Top) with 70000 km sold for 19000 SAR on 2024-09-13. Considering the higher mileage and average condition of the target car, I adjusted the price downwards from the average of these data points.