To estimate the price of the 2015 Mercedes SLK200 1.8L I4 Standard convertible with 140000 km mileage, I first looked at the selling price of a similar car: a 2014 Mercedes SLK200 2.0L Turbo V4 coupe with 116900 km sold for AED 42000 on 2023-12-18. Given the higher mileage and convertible body type of the target car, I adjusted the price downwards. Next, I considered the listed prices of similar cars: a 2015 SLK200 1.8L I4 convertible with the same mileage listed for AED 53000, a 2013 SLK200 2.0L Turbo convertible with 140100 km listed for AED 40000, and a 2014 SLK200 1.8L I4 convertible with 142000 km listed for AED 48500. These listings suggest a market range between AED 40000 and AED 53000. Given the condition of the target car is not specified as good, I leaned towards the lower end of this range. Factoring in the depreciation and the condition, I estimated the market price accordingly.