I started by looking at the selling prices of similar cars. The 2011 BMW 650 sedan with 128300 km sold for AED 55000 in November 2023, and the 2012 BMW 650 coupe with 141900 km sold for AED 41000 in April 2024. Given the convertible body type of the target car, I considered the listed price of a similar 2011 BMW 650 convertible with 138000 km, which is AED 55000. However, listed prices are generally higher than selling prices. Considering the condition of the target car is not specified as 'Average' and the mileage is similar to the sold cars, I adjusted the price downwards. The average selling price of the two sold cars is AED 48000. Given the convertible body type, which typically has a higher value, I estimated the price slightly higher than the average selling price of the sedans and coupes.