To estimate the price of the 2012 Mercedes E200 I4 2.0L Twin Turbo Standard with 274000 km mileage, I first looked at the selling price of a similar car: a 2013 Mercedes E200 I4 2.0L Turbocharged with 176000 km sold for SAR 47500 on 2024-02-17. Given the higher mileage of the target car, I adjusted the price downwards. Next, I reviewed listed prices of similar cars: a 2014 model with 192000 km listed for SAR 70000, a 2013 model with 191000 km listed for SAR 43000, and another 2013 model with 176000 km listed for SAR 49500. Considering the higher mileage and older model year of the target car, I further adjusted the price downwards. The average of these listed prices, adjusted for mileage and age, supports a lower estimate. Therefore, I arrived at the final estimate by considering the selling price and adjusting for the higher mileage and older model year.