To estimate the price of the 2015 Kia Optima I4 2.4L LX (Mid) with 99600 km mileage in good condition, I considered several data points. The most relevant selling prices are: 2015 Kia Optima I4 2.4L LX (Mid) with 148000 km sold for 34000 SAR on 2024-04-03, and another 2015 Kia Optima I4 2.4L LX (Mid) with 165000 km sold for 29000 SAR on 2024-06-24. Given the lower mileage and good condition of the target car, it should be valued higher than these examples. Additionally, a similar car with 248000 km sold for 26000 SAR on 2024-08-07, which further supports a higher valuation for the target car. Considering the listed prices of similar cars (38500 SAR and 39000 SAR), which are generally higher than selling prices, I adjusted the estimate accordingly. Factoring in the lower mileage and good condition, I arrived at a final estimate.