New Revised Standard Version
They shall compute with the purchaser the total from the year when they sold themselves to the alien until the jubilee year; the price of the sale shall be applied to the number of years: the time they were with the owner shall be rated as the time of a hired laborer.

Contemporary English Version
by paying your owner for the number of years you would still be a slave before the next Year of Celebration.

New American Bible
With the purchaser they shall compute the years from the sale to the jubilee, distributing the sale price over these years as though they had been hired as laborers.

Douay-Rheims Bible
Counting only the years from the time of his selling unto the year of the jubilee: and counting the money that he was sold for, according to the number of the years and the reckoning of a hired servant.

Counting only the years from the time of his selling unto the year of the jubilee: and counting the money that he was sold for, according to the number of the years and the reckoning of a hired servant.

reckon

Leviticus 25:27 The value of the fruits shall be counted from that time when he sold it. And the overplus he shall restore to the buyer, and so shall receive his possession again.

Leviticus 5:8 And he shall give them to the priest: who shall offer the first for sin, and twist back the head of it to the little pinions, so that it stick to the neck, and be not altogether broken off.

) that this was done by the Jews on their return from the Babylonish captivity.

according to the time

Leviticus 25:40,53 But he shall be as a hireling, and a sojourner: he shall work with thee until the year of the jubilee. . . .

Deuteronomy 15:18 Turn not away thy eyes from them when thou makest them free: because he hath served thee six years according to the wages of a hireling: that the Lord thy God may bless thee in all the works that thou dost.

Job 7:1,2 The life of man upon earth is a warfare, and his days are like the days of a hireling. . . .

Job 14:6 Depart a little from him, that he may rest until his wished for day come, as that of the hireling.

Isaiah 16:14 And now the Lord hath spoken, saying: In three years, as the years of a hireling, the glory of Moab shall be taken away for all the multitude of the people, and it shall be left small and feeble, not many.

Isaiah 21:16 For thus saith the Lord to me: Within a year, according to the years of a hireling, all the glory of Cedar shall be taken away.