וְאִם־גָּאֹ֖ל יִגְאָלֶ֑נָּה וְיָסַ֥ף חֲמִישִׁת֖וֹ עַל־עֶרְכֶּֽךָ׃
But if he will indeed redeem it, then he shall add the fifth part thereof unto thy valuation.
Targum Jonathan on Leviticus
But if he would redeem it, let him add a fifth of its price upon that of its valuation.
Targum Jerusalem
And let him add a fifth of its price above its valuation.