To estimate the price of the 2018 Mercedes E300 I4 2.0L Turbocharged with 109800 km mileage in average condition, I analyzed the listed prices of similar cars. The closest match is a 2018 Mercedes E300 with 91000 km listed for AED 149999. Considering the higher mileage and average condition of the target car, a downward adjustment is necessary. Other relevant data points include a 2017 E300 with 108000 km listed for AED 119000 and a 2017 E300 with 137000 km listed for AED 125500. These listings suggest a price range between AED 119000 and AED 149999. Given the target car's mileage and condition, I estimate its market price to be slightly lower than the lower end of this range.