To estimate the price of the 2015 Mercedes A250 I4 2.0L Turbocharged Standard with 138000 km mileage, I analyzed the listed prices of similar cars. The closest match is a 2015 Mercedes A250 with the same engine and mileage listed for AED 42500. Other 2015 models with slightly different mileages are listed between AED 47500 and AED 56000. Older models (2013) with similar mileage are listed around AED 41000. Considering the car's average condition and the fact that listed prices are generally higher than selling prices, I adjusted the estimate slightly lower than the average listed price for similar models.