To estimate the price of the 2021 Mazda CX-9 I4 2.5L Grade 1 (Base+), I considered the following data points: 1. A 2021 Mazda CX-9 I4 2.5L Turbocharged with 50000 km, average condition, sold for 83000 SAR on 2024-08-27. 2. A 2020 Mazda CX-9 I4 2.5L Turbocharged with 161000 km, average condition, sold for 74000 SAR on 2024-01-05. 3. A 2020 Mazda CX-9 I4 2.5L Turbocharged with 34000 km, good condition, sold for 102000 SAR on 2024-01-20. 4. A 2020 Mazda CX-9 I4 2.5L Turbocharged with 40000 km, average condition, sold for 100000 SAR on 2024-07-18. 5. A 2021 Mazda CX-9 I4 2.5L Turbocharged, Grade 1 (Base+), with 61000 km, listed for 105000 SAR but delisted on 2024-08-04. Considering the car's mileage of 37000 km and good condition, I adjusted the price slightly higher than the average condition cars but lower than the top condition cars. The closest match in terms of variant and condition is the 2020 model with 34000 km sold for 102000 SAR.