To estimate the price of the 2015 Nissan X-Trail SL 2.5L I4 with 156620 km mileage in average condition, I considered the following data points: 1) A similar car with the same variant and better condition (good) sold for AED 43000 on 2023-12-17 with 113900 km. 2) Another similar car with the same variant and similar condition (average) sold for AED 38900 on 2024-01-13 with 131300 km. 3) A similar car with the same variant and average condition sold for AED 41000 on 2023-09-03 with 131600 km. 4) A similar car with a different variant (S 4WD) and average condition sold for AED 32000 on 2024-05-22 with 190800 km. 5) Offers accepted for similar cars ranged from AED 35500 to AED 45000, with the closest match being AED 45000 for a car with 113900 km on 2023-11-26. Considering the higher mileage and average condition of the target car, I adjusted the price downwards from the highest selling price of AED 43000.