To estimate the price of the 2020 Hyundai Elantra I4 2.0L GLS (Top) with 56,000 km mileage, I first considered the selling prices of similar cars. A 2022 Elantra 2.0L Turbo GLS (Top) sold for 110,000 SAR, but it's newer and turbocharged, so it's not directly comparable. A 2019 Elantra 2.0L GL (Mid) sold for 46,000 SAR, and a 2020 Elantra 1.6L Smart (Base) sold for 49,000 SAR. The 2020 Elantra GLS (Top) should be valued higher than the 1.6L Smart (Base) due to its higher trim and engine size. Considering the listed prices, a 2020 Elantra 2.0L GL (Mid) was listed for 53,000 SAR, and a 2018 Elantra 2.0L GLS (Top) was listed for 50,000 SAR. Given the car's good condition and lower mileage, I estimate its market price to be slightly higher than the 2020 GL (Mid) and 2018 GLS (Top) listings.