To estimate the price of the 2018 Kia Cadenza V6 3.3L EX (Top) with 138000 km mileage, I first considered the selling price of a similar 2016 Kia Cadenza V6 3.5L EX (Top) with 250850 km mileage, which sold for SAR 31000 in December 2023. Given the 2-year difference and higher mileage, I adjusted the price upwards. Next, I looked at the listed prices of similar 2018 models. The closest match, a 2018 Kia Cadenza V6 3.3L EX (Top) with the same mileage, was listed for SAR 56000. Other listings for 2018 models ranged from SAR 33000 to SAR 84500, depending on mileage and trim. Considering the average condition of the target car and the fact that listed prices are generally higher than selling prices, I estimated the market price by balancing these data points.