To estimate the price of the 2021 GMC Yukon Denali V8 6.2L Denali, I started by looking at the new car prices for different variants of the 2025 GMC Yukon. The Denali trim is a higher-end variant compared to the listed trims (AT4, SLE, SLT). The highest price among the listed trims is for the 2025 GMC Yukon 5.3 V8 AT4 (AWD) at SAR 321400. Given that the Denali trim is more premium, I estimate its new price to be around SAR 350000. Applying a 10% annual depreciation over three years (2021 to 2024), the depreciation factor is approximately 0.729 (0.9^3). Therefore, the estimated price is SAR 350000 * 0.729, which equals approximately SAR 255150. Considering the car's good condition and mileage of 64500 km, I believe this is a fair market price estimate.