To estimate the price of the 2017 Kia Cerato I4 1.6L LX 1.6L (Base) with 121000 km mileage and average condition, I analyzed the selling prices of similar cars. The most relevant data points are: 2017 Kia Cerato with 162000 km sold for 33400 SAR on 2024-01-03, 2017 Kia Cerato with 123000 km sold for 37000 SAR on 2024-03-15, and 2018 Kia Cerato with 154000 km in good condition sold for 32500 SAR on 2023-09-20. Considering the mileage and condition, the 2017 model with 123000 km is the closest match, suggesting a price around 37000 SAR. Adjusting for the slightly lower mileage of the target car, the estimated price is slightly higher than 33400 SAR but lower than 37000 SAR. Therefore, the estimated market price is around 35000 SAR.