To estimate the price of the 2015 Kia Optima I4 2.0L GDI (Base) in bad condition with 289000 km mileage, I considered the following data points: 1. A 2015 Kia Optima I4 2.0L GDI (Base) with 237000 km in average condition sold for 29000 SAR on 2023-12-11. Adjusting for higher mileage and worse condition, I estimate a reduction of around 5000 SAR. 2. A 2016 Kia Optima I4 2.0L GDI (Base) with 290000 km sold for 26500 SAR on 2024-02-23. Adjusting for the model year difference, I estimate a reduction of around 2000 SAR. 3. A 2015 Kia Optima I4 2.4L GDI (Base) with 256500 km in average condition sold for 34000 SAR on 2023-04-28. Adjusting for engine size, mileage, and condition, I estimate a reduction of around 8000 SAR. 4. A 2015 Kia Optima I4 2.4L GDI (Base) with 175000 km in average condition sold for 32000 SAR on 2023-10-31. Adjusting for mileage and condition, I estimate a reduction of around 10000 SAR. 5. A 2015 Kia Optima I4 2.4L GDI (Base) with 299000 km was listed for 33000 SAR but delisted on 2023-12-25. Considering it was not sold, I estimate a reduction of around 10000 SAR. Based on these adjustments, I estimate the market price to be around 24000 SAR.