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.
Read kabbalistic (mystical) interpretation of Leviticus 27:13: and classical mystical sources.