To estimate the price of the 2013 GMC Terrain SLT V6 3.6L Denali, I first looked at the selling prices of similar cars. The 2014 GMC Terrain SLT AWD 3.6L V6 with 162800 km sold for AED 25000, the 2012 GMC Terrain 2.4L I4 with 162000 km sold for AED 21000, and the 2015 GMC Terrain SLT2 3.6L V6 with 129000 km sold for AED 27000. Given that the target car is a 2013 model with higher mileage (221200 km) and in average condition, I adjusted the price downwards. I also considered the listed prices of similar cars, such as the 2015 GMC Terrain SLE 3.6L V6 with 166000 km listed for AED 24000 and the 2014 GMC Terrain 3.6L V6 with 114700 km listed for AED 29000. Taking into account the higher mileage and average condition of the target car, I estimated a lower price than these listings. Finally, I factored in the depreciation and the fact that the target car is a top variant (Denali), which typically holds value better.