To estimate the price of the 2021 Renault Duster I4 1.6L SE (Mid) with 31000 km mileage, I considered the following data points: 1) A 2021 Renault Duster I4 2.0L SE (Mid) with 90000 km sold for 39000 SAR on 2023-11-23. Adjusting for mileage and engine size, the price would be higher for the 1.6L with lower mileage. 2) A 2020 Renault Duster I4 2.0L LE (Top) with 56000 km sold for 35000 SAR on 2023-12-06. The SE (Mid) variant would be slightly lower in value. 3) Two 2019 Renault Duster I4 2.0L SE (Mid) with 50000 km sold for 36500 SAR on 2024-03-31 and 2024-05-30. Adjusting for the model year and mileage, the 2021 model would be higher. 4) A 2021 Renault Duster I4 1.6L SE (Mid) with 31000 km is listed for 43000 SAR, and another with 68000 km listed for 40000 SAR. Considering these factors, the estimated market price is derived.