The contract duration of a rental car company is five years and based on this period the company determines the rent taking into consideration the type of the car itself, the decrease in its market value and other factors. If the rented car is brand new, its market value is high. For example, if the rental contract extends for one year, the rent is (500 euros) per month. If it is three years, the rent is (330 euros) per month. If the lessee wanted to terminate the latter form of contract (3 years) before it expires, the lessor accepts under the condition that the former pays the difference between the two forms of the contract above mentioned. In other words, the lessee pays a certain sum to the rental car company against termination of contract. On its part, the company says that this is better than obligating the lessee to pay the whole rent till the end of the contract`s period. The company adds that since it bought the car to be used by the lessee, it calculated its actual value and the decrease in that market value and this is the reason for setting a higher rent against a shorter period of rental contract. What is the ruling of Sharia on this along with mentioning textual evidence from Sharia sources?