To estimate the price of the 2018 Nissan X-Trail I4 2.5L S 2WD (5-Seater) (Base) with 134000 km mileage and average condition, I considered the following data points: 1) A similar car with the same variant and condition sold for 40000 SAR on 2024-01-13. 2) Another similar car with the same variant but 135000 km mileage was listed for 47500 SAR and delisted on 2024-01-14. 3) A similar car with the same variant and 134000 km mileage is currently listed for 64000 SAR. Given the selling price of 40000 SAR for a similar car in average condition and the listed prices, I estimate the market price to be slightly higher than 40000 SAR but lower than the listed prices, considering the car's condition and mileage.