To estimate the price of the 2018 Nissan Altima SV I4 2.5L SV (Mid+), I considered the selling prices of similar cars. The closest match is the 2017 Nissan Altima V6 3.5L SV (Mid+) with 155000 km sold for 37500 SAR on 2024-07-22. Adjusting for the engine difference and lower mileage, the 2018 model should be valued higher. The 2017 Altima I4 2.5L Turbo SL (Top+) with 140000 km sold for 61500 SAR on 2023-12-08, and the 2017 Altima SL I4 2.5L with 134500 km sold for 40000 SAR on 2024-01-23. Considering the 2018 model year, lower mileage, and mid+ trim, I estimate the price to be around 50000 SAR.