To estimate the price of the 2015 Audi A6 I4 2.0 L Turbocharged 35 TFSI (Base) with 200000 km mileage in average condition, I considered the following data points: 1. A 2013 Audi A6 I4 2.0L Turbocharged 45 TFSI (Top) with 259000 km sold for 27099 SAR on 2023-10-26. 2. A 2016 Audi A6 35 TFSI I4 1.8L Turbocharged 40 TFSI (Base) with 255000 km sold for 45000 SAR on 2023-11-07. 3. A 2016 Audi A6 35 TFSI I4 2.0L Turbocharged 40 TFSI (Base) with 215500 km sold for 40000 SAR on 2023-11-20. 4. A 2016 Audi A6 I4 1.8L 45 TFSI (Top) with 195000 km sold for 46500 SAR on 2024-04-28. 5. A 2013 Audi A6 I4 2.0L 40 TFSI (Base) with 128000 km sold for 38500 SAR on 2024-05-05. 6. A 2015 Audi A6 35 TFSI I4 2.0L Turbocharged 45 TFSI (Top) with 259000 km sold for 37500 SAR on 2024-05-25. 7. A 2014 Audi A6 I4 2.0L 55 TFSI (Top+) with 219000 km sold for 43500 SAR on 2024-05-31. The closest match is the 2015 Audi A6 35 TFSI I4 2.0L Turbocharged 45 TFSI (Top) with 259000 km sold for 37500 SAR. Considering the target car's base variant and similar mileage, I adjusted the price downwards. The listed price of a similar car is 55500 SAR, which is higher than actual selling prices. Therefore, I estimated the market price based on the selling prices of similar cars, especially the 2015 model.