To estimate the price of the 2015 Nissan Sentra I4 1.8L S (Base) with 197924 km mileage and average condition, I considered the following data points: 1. A similar car with 166000 km and good condition sold for 25000 SAR on 2024-08-07. Given the higher mileage and average condition of the target car, I adjusted the price downwards. 2. Another similar car with 114000 km and good condition sold for 26000 SAR on 2023-10-22. Again, I adjusted the price downwards due to higher mileage and average condition. 3. A 2016 model with 211000 km and average condition sold for 25000 SAR on 2024-07-18. Considering the target car is a year older but has slightly lower mileage, I adjusted the price slightly downwards. 4. Listed prices for similar cars ranged from 23000 SAR to 29000 SAR, but these are generally higher than actual selling prices. Considering all these factors, I estimated the market price accordingly.