To estimate the price of the 2018 Toyota Yaris I4 1.5L STD (M/T) (Base+), I first considered the selling prices of similar cars. The 2019 Yaris with a similar engine but a different variant (Y CVT Mid) sold for 41000 SAR with lower mileage. A 2020 Yaris with higher mileage and average condition sold for 39000 SAR. A 2017 Yaris with a smaller engine and higher mileage sold for 31000 SAR. These prices suggest a range for the 2018 model. Next, I looked at listed prices. A 2018 Yaris with similar specs was listed for 33000 SAR, and a 2020 model with similar specs was listed for 37000 SAR. Considering the car's good condition and mileage, I estimated the price slightly higher than the 2017 model's selling price but lower than the 2019 model's selling price, aligning with the listed prices.