The only data point available is the new car price for a 2024 Chery E5 Standard Sedan, which is AED 51,000. Given that the car in question is a 2018 model, we need to account for depreciation. Assuming a 10% depreciation per year, the car would depreciate by 60% over 6 years. Therefore, the estimated depreciation amount is 51,000 * 0.60 = 30,600 AED. Subtracting this from the new car price, the estimated market price is 51,000 - 30,600 = 20,400 AED. Additionally, considering the high mileage of 200,000 km, we should further reduce the price by approximately 10%, resulting in a final estimate of 20,400 * 0.90 = 18,360 AED.