To estimate the price of the 2020 Mitsubishi Attrage I3 1.2L Standard with 21000 km mileage in average condition, I first looked at the selling prices of similar cars. The 2019 model with 44000 km in good condition sold for 28000 SAR, and the 2018 model with 76000 km in average condition sold for 23000 SAR. The 2022 model with 41000 km in good condition sold for 37000 SAR. The 2018 model with 76000 km in average condition sold for 24000 SAR, and another 2018 model with 130000 km sold for 24500 SAR. The 2019 model with 175000 km in average condition sold for 22000 SAR. Considering the 2020 model's lower mileage and average condition, I adjusted the price slightly higher than the 2018 and 2019 models but lower than the 2022 model. I also considered the listed prices of similar 2020 models, which ranged from 25000 to 29000 SAR. Taking all these factors into account, I arrived at the final estimate.