To estimate the price of the 2016 Audi A6 I4 1.8L Turbo Charged 55 TFSI (Top+), I considered several data points. First, I looked at the selling prices of similar cars. The closest match in terms of variant and condition is the 2016 Audi A6 I4 2.0L Turbo Charged 55 TFSI (Top+), which sold for SAR 80000 on 2024-09-04 with a mileage of 56000 km. Given that the target car has a higher mileage of 182470 km and is in average condition, I adjusted the price downwards. Other relevant data points include a 2016 Audi A6 I4 1.8L with 195000 km sold for SAR 46500 on 2024-04-28, and a 2016 Audi A6 35 TFSI I4 1.8L Turbocharged with 255000 km sold for SAR 45000 on 2023-11-07. Considering the higher mileage and average condition, I estimated the price to be lower than these figures. The listed price of a similar car (2016 Audi A6 50 TFSI Quattro S-Line V6 3.0L Turbocharged) was SAR 75000, but this is not directly comparable due to different engine and trim. Therefore, I estimated the market price by considering the depreciation due to higher mileage and average condition.