To estimate the price of the 2021 Hyundai Elantra I4 1.6L Smart (Base), I first considered the selling prices of similar cars. The most relevant data point is the 2023 Hyundai Elantra I4 1.6L Smart (Base) with 38,000 km sold for 62,000 SAR on 2024-02-01. Given the target car is a 2021 model with higher mileage (45,200 km), I expect a lower price. The 2020 Hyundai Elantra I4 1.6L GL (Mid) with 44,000 km sold for 46,000 SAR on 2023-06-17, which is a lower trim and older model, suggesting a price slightly above this. The 2019 Hyundai Elantra I4 1.6L Smart (Base) with 87,000 km sold for 42,300 SAR on 2023-05-30, indicating depreciation over time. Considering these factors, the estimated price for the 2021 model should be between 46,000 and 62,000 SAR. Adjusting for the model year and mileage, I estimate the price to be around 55,000 SAR.