There is no data provided for selling prices, offers accepted, listed prices, or ad prices of similar cars. Additionally, there is no data on the price of new Saudi-spec cars for different variants. Therefore, I will use a general depreciation logic to estimate the price. Assuming a new car price of 100,000 SAR for a 2017 Lifan 820 I4 2.4L S (Top) and applying a 10% depreciation per year over 7 years, the estimated price is calculated as follows: 100,000 SAR * (0.9^7) = 47,829 SAR. Considering the car's average condition and mileage, I will adjust the price down slightly to account for these factors.