To estimate the price of the 2015 Audi A4 I4 1.8L 30 TFSI (Base) with 133000 km mileage and average condition, I considered the following data points: 1. A 2015 Audi A4 45 TFSI Quattro I4 2.0L Turbocharged with 239109 km, good condition, sold for 36500 SAR on 2023-10-20. This car is a higher trim and has higher mileage. 2. A 2014 Audi A4 I4 1.8L 30 TFSI (Base) with 194000 km, average condition, sold for 27000 SAR on 2024-06-28. This car is the same trim but older and with higher mileage. 3. A 2015 Audi A4 I4 2.0L Turbocharged 30 TFSI Sport (Top) with 191000 km listed for 42000 SAR. This car is a higher trim and has higher mileage. 4. A 2014 Audi A4 I4 1.8L 30 TFSI (Base) with 194000 km listed for 27000 SAR. This car is the same trim but older and with higher mileage. 5. A 2015 Audi A4 45 TFSI Quattro I4 2.0L Turbocharged 30 TFSI Sport (Top) with 239109 km listed for 40000 SAR. This car is a higher trim and has higher mileage. Considering the selling prices and listed prices, I adjusted for the lower mileage and average condition of the target car.