To estimate the price of the 2022 GAC GS3 I4 1.5L GS (Mid) with 78500 km mileage, I first looked at the selling prices of similar cars. The closest match is a 2022 GAC GS3 I4 1.5L Standard variant with 57900 km sold for SAR 40000 on 2023-10-29. Considering the higher mileage of the target car, I adjusted the price downwards. Another relevant data point is a 2022 GAC GS3 I4 1.3L Turbocharged GE (Top) variant with 47894 km sold for SAR 31000 on 2023-12-05. Given the target car's higher mileage and lower trim, I adjusted the price accordingly. I also considered listed prices: a 2022 GAC GS3 I4 1.5L Standard with 71000 km was listed for SAR 34500 and delisted on 2024-08-08, and another with 89000 km was listed for SAR 32500 and delisted on 2024-02-17. These listings suggest a market range of SAR 32500 to SAR 34500. Taking into account the target car's mid trim and mileage, I estimated the price to be slightly lower than the average of these listings.