To estimate the price of the 2019 Mazda 6 I4 2.5L Signature (Top+), I considered several data points. First, I looked at the selling prices of similar cars. The 2020 Mazda 6 I4 2.5L Ignite (Top) with 138000 km sold for 69000 SAR on 2024-06-12. The 2017 Mazda 6 I4 2.5L Core (Base+) with 207000 km sold for 29500 SAR on 2024-04-22. The 2021 Mazda 6 I4 2.5L Turbocharged Ignite (Top) with 94000 km sold for 90500 SAR on 2023-10-26. The 2017 Mazda 6 I4 2.5L R (Mid) with 90000 km sold for 31000 SAR on 2023-10-22. The 2017 Mazda 6 I4 2.5L S (Base) with 155000 km sold for 46000 SAR on 2023-10-09. The 2019 Mazda 6 I4 2.5L Signature (Top+) with 219000 km is listed for 67000 SAR but not delisted. Considering the higher mileage and average condition of the target car, I adjusted the price downwards from the listed price. The selling prices of similar cars with lower mileage and different trims also helped in adjusting the estimate. The final estimate is based on the average of these data points, considering the car's condition, mileage, and trim level.