To estimate the price of the 2021 Hyundai Elantra I4 2.0L Smart (Base) with 91566 km mileage, I first looked at the selling prices of similar cars. A 2021 Elantra I4 2.0L GL (Mid) with 104000 km sold for 47500 SAR in June 2024. A 2023 Elantra I4 1.6L Smart (Base) with 38000 km sold for 62000 SAR in February 2024. A 2020 Elantra I4 2.0L GLS (Top) with 103000 km sold for 64500 SAR in April 2024. The closest match in terms of variant and condition is the 2023 Elantra I4 1.6L Smart (Base) which sold for 62000 SAR, but it has a lower mileage. Considering the higher mileage of the target car, I adjusted the price downwards. I also considered the listed prices of similar cars: a 2021 Elantra I4 2.0L Smart (Base) with 91654 km was listed for 52000 SAR, and another with 120600 km was listed for 51000 SAR. These listings suggest a market range around 51000-52000 SAR. Taking all these factors into account, I estimated the market price accordingly.