I started by examining the selling prices of similar cars. The most relevant data point is the 2016 Mazda 6 I4 2.5L S (Base) with 222,000 km sold for SAR 28,000 on 2024-06-30. This car is very similar to the target car in terms of variant and condition. The other two selling prices were for the Core (Base+) variant, which is slightly higher in trim, and they sold for SAR 37,000 and SAR 37,500, but these are less relevant due to the different variant. Next, I looked at the listed prices. The most relevant listing is the 2016 Mazda 6 I4 2.5L S (Base) with 222,000 km listed for SAR 29,500, which aligns closely with the selling price of SAR 28,000. Other listings for the S (Base) variant range from SAR 28,500 to SAR 44,500, but these are not actual selling prices. Considering the selling price of SAR 28,000 and the similar listing price of SAR 29,500, I estimate the market price to be slightly above the last known selling price due to the time elapsed since the sale.