To estimate the price of the 2019 Maserati Quattroporte V6 3.0L Turbocharged Standard with 50000 km mileage, I considered the listed prices of similar cars. The closest match is a 2019 Maserati Quattroporte V6 3.0L Turbocharged Standard with the same mileage listed for AED 140500. Other relevant listings include a 2019 Maserati Quattroporte GTS (Top) with 54869 km listed for AED 130000, and a 2019 Maserati Quattroporte S Q4 (Mid+) with 61200 km listed for AED 220000. Given that the car in question is in average condition, I adjusted the price slightly lower than the closest match to account for potential negotiation and condition.