To estimate the price of the 2015 Infiniti Q50 V6 3.7L Sport (Top) with 154000 km mileage, I considered the following data points: 1. The selling price of a 2017 Infiniti Q50 S V6 3.0L Twin Turbo Red Sport 400 (Top+) with 9700 km mileage sold for SAR 95000 on 2023-12-02. This car is newer and has a more powerful engine, so it would be priced higher. 2. The listed price of a similar 2015 Infiniti Q50 V6 3.7L Sport (Top) with the same mileage of 154000 km is SAR 49500. This is a direct comparison and provides a strong reference point. 3. Other listed prices include a 2016 Infiniti Q50 I4 2.0L Turbo Luxe (Base) with 115000 km for SAR 58000, and a 2016 Infiniti Q50 I4 2.0L Sensory (Mid) with 89000 km for SAR 43500. These cars have smaller engines and different trims, so they are less comparable but still provide context. 4. Considering the depreciation and the condition of the car, the most relevant data point is the listed price of the same model and year at SAR 49500. Adjusting slightly for market conditions and average condition, the estimated price is derived.