To estimate the price of the 2015 Audi Q7 V6 3.0L supercharged 55 TFSI (Top) with 171200 km mileage, I considered several data points. First, I looked at the selling prices of similar cars: a 2015 Audi Q7 with 247000 km sold for 58000 SAR, a 2016 Audi Q7 with 101000 km sold for 72500 SAR, a 2016 Audi Q7 with 153000 km sold for 95000 SAR, and a 2015 Audi Q7 with 107000 km sold for 75000 SAR. Given the higher mileage and average condition of the target car, I adjusted the price downwards. Next, I reviewed listed prices: a 2015 Audi Q7 with 127000 km was listed for 48000 SAR, a 2014 Audi Q7 with 175000 km was listed for 35000 SAR, and a 2016 Audi Q7 with 178600 km was listed for 75000 SAR. Considering the average condition and higher mileage of the target car, I further adjusted the price. Finally, I factored in depreciation and market trends to arrive at a fair estimate.