Read Leviticus 25:50 Using Other Translations
And he shall reckon with him that bought him from the year that he was sold to him unto the year of jubile: and the price of his sale shall be according unto the number of years, according to the time of an hired servant shall it be with him.
He shall calculate with his buyer from the year when he sold himself to him until the year of jubilee, and the price of his sale shall vary with the number of years. The time he was with his owner shall be rated as the time of a hired servant.
They will negotiate the price of their freedom with the person who bought them. The price will be based on the number of years from the time they were sold until the next Year of Jubilee—whatever it would cost to hire a worker for that period of time.