To estimate the price of the 2020 Changan CS75 I4 1.8L Turbocharged Plus Limited (Top) with 131000 km mileage, I first looked at the selling prices of similar cars. The closest match is a 2020 Changan CS75 I4 1.8L Plus Limited (Top) with 109000 km sold for SAR 41000 on 2023-09-23. Another similar car, a 2020 Changan CS75 I4 1.8L Turbocharged Plus Smart (Mid) with 86000 km sold for SAR 39000 on 2023-11-21. Given the higher mileage of the target car, its value would be slightly lower. Next, I reviewed the listed prices of similar cars. The most relevant listings include a 2020 Changan CS75 I4 1.8L Turbocharged Plus Limited (Top) with 131000 km listed for SAR 49000, and another with 150500 km listed for SAR 45000. These listings are higher than the actual selling prices, indicating that the market price is likely lower. Considering the selling prices and the listed prices, I adjusted for the higher mileage and market trends to arrive at the final estimate.