To estimate the price of the 2018 Chevrolet Spark I4 1.4L LT (Base) with 196000 km mileage, I first looked at the selling prices of similar cars. The 2019 model with 120500 km sold for 26000 SAR, the 2020 model with 34000 km sold for 31500 SAR, and another 2020 model with 94000 km sold for 26250 SAR. Given the higher mileage of the target car, its value should be lower. Next, I considered the listed prices of similar cars. The 2018 model with 196000 km is listed for 17000 SAR, and another 2018 model with 210000 km is listed for 20000 SAR. These listings suggest a range of 17000-20000 SAR. Considering the actual selling prices and the listed prices, I estimate the market price to be slightly lower than the average of the listed prices due to the high mileage and average condition.