Given the lack of specific data points such as actual selling prices, offers accepted, and listed prices, I will use the new car price and apply depreciation logic. Assuming a new 2020 Mercedes S320 I4 2.0L Turbo Standard sedan has a price of 300,000 AED, and considering a depreciation rate of 10% per year, the car would depreciate approximately 30% over three years. This results in a depreciation of 90,000 AED, bringing the estimated value to 210,000 AED. Adjusting for the average condition and mileage of 67,600 km, I estimate a further reduction of 10%, resulting in a final estimated price.