To estimate the price of the 2021 Mercedes GLC300 I4 2.0L Standard with 39060 miles, I first considered the actual selling price of a similar car with the same specs and mileage, which was AED 100000 on 2024-07-29. This is the most reliable data point. Next, I looked at an offer accepted by a seller for a similar car with lower mileage (12600 miles) at AED 95000 on 2024-06-01. This suggests that cars with lower mileage can fetch slightly lower prices. I also reviewed listed prices: AED 100000 for a car with the same mileage, AED 115000 for a car with 46500 miles, AED 95000 for a car with 25000 miles, AED 103000 for a car with 12600 miles, and AED 90000 for a car with 76500 miles. The listed prices are generally higher than the actual selling prices. Considering all these data points, the most accurate estimate for the car in question is AED 100000, aligning with the recent selling price of a similar car.