To estimate the price of the 2018 Opel Corsa 3 door hatchback with 100000 km mileage, I considered the listed prices of similar 2017 models. The listed prices for 2017 Opel Corsa 1.4L V4 5 door variants with similar mileage range from AED 17000 to AED 28000. The 2017 Opel Corsa 1.2L I3 with higher mileage is listed for AED 22000. Given that the car in question is a 2018 model, it should be valued slightly higher than the 2017 models. However, the 3 door variant might be less desirable than the 5 door variant, which could balance out the year difference. Considering these factors, I estimated the price accordingly.