To estimate the price of the 2016 Porsche Cayenne V6 3.6L Twin Power Turbo S (Mid) with 90000 km mileage and average condition, I considered several data points. First, I looked at the selling prices of similar cars. The 2016 Porsche Cayenne V8 4.8L Turbo Charged (Top) with 64000 km sold for 185000 SAR on 2024-03-07. Given the higher engine size and top variant, this car would be priced higher than the target car. The 2014 Porsche Cayenne V6 3.6L Turbocharged (Mid+) with 127000 km sold for 76500 SAR on 2023-10-18. Adjusting for the newer model year and lower mileage, the target car should be priced higher. The 2015 Porsche Cayenne GTS V6 3.6L Twin Turbo (Mid++) with 138000 km sold for 110000 SAR on 2024-04-19. Given the similar engine size but higher variant, the target car should be priced slightly lower. The 2018 Porsche Cayenne V6 3.0L (Base) with 146000 km sold for 204600 SAR on 2024-05-15. Adjusting for the newer model year and higher mileage, the target car should be priced lower. Next, I looked at listed prices of similar cars. The 2016 Porsche Cayenne V6 3.6L Twin Power Turbo S (Mid) with 90000 km was listed for 141000 SAR. Other similar listings ranged from 141000 to 165000 SAR. Considering these data points and adjusting for the average condition, I estimated the market price.