To estimate the price of the 2021 Nissan X-Trail I4 2.5L S 2WD (Base) with 40508 km, I first looked at the selling prices of similar cars. A similar car with 20800 km sold for AED 80000 on 2023-09-26. Another similar car with 46644 km was sold by a dealer for AED 80741.5 on 2023-10-06. These selling prices are the most reliable indicators. Next, I considered offers accepted by sellers: AED 78000 for a car with 53000 km and AED 85000 for a car with 17000 km. These offers are slightly higher but still useful. Finally, I reviewed listed prices: AED 73000 for a car with the same mileage, AED 83000 for a car with 36000 km, and AED 94990 for a car with 46644 km. These listed prices are generally higher than selling prices. Based on this data, I estimated the market price by giving more weight to actual selling prices and adjusting for mileage and condition.