To estimate the price of the 2020 Kia Optima I4 2.0L LX (Mid) with 50000 km mileage, I considered the listed prices of similar cars. The closest match is a 2020 Kia Optima I4 2.0L LX (Mid) with 49900 km listed for SAR 60500. Another 2020 Kia Optima I4 2.0L T-GDI GT (Top) with 51000 km is listed for SAR 72500, but this is a higher trim. A 2018 Kia Optima I4 2.4L T-GDI GT (Top) with 138500 km is listed for SAR 50500, but it is older and has higher mileage. Given the closest match is listed at SAR 60500, and considering the car's good condition, I estimate the market price accordingly.