To estimate the price of the 2015 Audi A4 I4 2.0L Turbo Charged 30 TFSI Sport (Top) with 191000 km mileage and average condition, I considered the following data points: 1. A similar 2015 Audi A4 45 TFSI Quattro I4 2.0L Turbocharged with 239109 km, good condition, sold for SAR 36500 on 2023-10-20. Given the higher mileage and better condition, this car's price is slightly higher. 2. A 2014 Audi A4 I4 1.8L with 194000 km, average condition, sold for SAR 27000 on 2024-06-28. This car has a lower trim and similar mileage, so its price is lower. 3. Listed prices: A 2015 Audi A4 45 TFSI Quattro I4 2.0L Turbocharged with 239109 km is listed for SAR 40000, which is higher than the selling price. A 2014 Audi A4 I4 1.8L with 194000 km is listed for SAR 27000, and a 2015 Audi A4 I4 1.8L with 133000 km is listed for SAR 34500. Considering these data points, the estimated price for the target car is adjusted to reflect its average condition and mileage.