There is no data provided for selling prices, offers accepted, cars sold by dealers, or listed prices of similar cars. Additionally, there is no information on the price of new GCC-spec cars. Given the lack of specific data, we will use a general depreciation logic. Assuming a new Mercedes C250 2.0L I4 Standard sedan costs around 200,000 AED in 2017, and applying a 10% depreciation per year over 7 years, the estimated value would be calculated as follows: 200,000 AED * (0.9^7) = 104,460 AED. Considering the car is in average condition and has high mileage, we will further reduce the price by approximately 15%, resulting in an estimated price of around 88,791 AED.