To estimate the price of the 2022 Changan Eado Plus I4 1.6L Trend (Base) with 77700 km mileage, I first looked at the selling prices of similar cars. The 2022 Changan Eado I4 1.4L Limited (Top) with 92000 km sold for 39000 SAR on 2023-12-11, and the 2021 Changan Eado I4 1.6L Limited (Top) with 146000 km sold for 32500 SAR on 2024-05-24. Considering the higher trim and mileage, these prices suggest a lower value for the base model. Next, I reviewed the new car prices: the 2025 Changan Eado Trend (Base) starts at 59961 SAR. Applying a 10% annual depreciation for two years, the estimated value is around 48569 SAR. Finally, I checked listed prices: a 2020 Changan Eado I4 1.6L Trend (Base) with 127000 km was listed for 34000 SAR. Given the lower mileage and newer model year of the target car, I adjusted the estimate upwards. Combining these data points, I arrived at a final estimate.