To estimate the price of the 2020 MG 5 I4 1.5L STD (Base) with 73000 km mileage, I primarily considered the actual selling prices of similar cars. The most relevant data points are: 1) A 2020 MG 5 I4 1.5L STD (Base) with 73690 km sold for 30000 SAR on 2023-10-06. 2) Another 2020 MG 5 I4 1.5L STD (Base) with 73690 km sold for 29000 SAR on 2023-10-15. 3) A 2021 MG 5 I4 1.5L STD (Base) with 67000 km sold for 29500 SAR on 2024-01-28. These prices are very close to each other, indicating a consistent market value. Additionally, the listed prices for similar cars are 31000 SAR, 30000 SAR, and 33000 SAR, which are slightly higher but align with the selling prices. Considering the car's condition and mileage, I estimate the market price to be slightly below the average of the selling prices to account for depreciation over time.