I started by looking at the selling prices of similar cars. The most relevant data point is the 2020 Toyota Corolla I4 1.6L XLI (Base) with 136593 km sold for 53000 SAR on 2023-11-07. Given that the car in question has lower mileage (100000 km), it should be valued slightly higher. The 2018 models with higher mileage and average condition sold for 36000 SAR and 48000 SAR, indicating that older models with more wear and tear are valued lower. The listed prices for similar 2020 models range from 50000 SAR to 62500 SAR, but these are generally higher than actual selling prices. Considering the selling price of the most similar car and adjusting for mileage and condition, I estimate the market price to be slightly higher than 53000 SAR but lower than the highest listed price.