To estimate the price of the 2012 GMC Acadia V6 3.6L AT4 (AWD) (Mid) with 276000 km mileage and average condition, I considered several data points. First, I looked at the selling prices of similar cars. The closest match is a 2013 GMC Acadia V6 3.6L AT4 (AWD) (Mid) with 190000 km sold for 34000 SAR on 2023-07-26 and another 2013 model with 153000 km sold for 20500 SAR on 2024-05-06. Given the higher mileage and average condition of the target car, I adjusted the price downwards. Additionally, a 2012 GMC Acadia SLT2 (AWD) (Mid+) with 185000 km sold for 15000 SAR on 2024-05-13, which is a lower trim but provides a reference for depreciation. The listed prices for similar cars with the same mileage are 20000 SAR, 19500 SAR, and 26500 SAR. Considering these factors, I estimated the market price by balancing the higher mileage and average condition against the listed prices and recent sales data.