The car to be estimated is a 2016 BYD F3 I4 1.5L Standard in average condition. The only relevant data point is a 2018 BYD F3 I4 1.5L Standard in good condition, sold for 21500 SAR in August 2023. Considering the 2016 model is two years older and in average condition, we apply depreciation and condition adjustments. Assuming a 10% annual depreciation, the 2016 model would be approximately 20% less valuable than the 2018 model. Additionally, the average condition may further reduce the value by around 10%. Therefore, we estimate the price by reducing the 2018 selling price by 30%, resulting in an estimated price for the 2016 model.