What is the legal consequence when someone states, 'I owe two dirhams over ten,' and claims they intended calculation (i.e., 2/10ths of 10)?

Primary text

If a debtor states, 'I owe two dirhams over ten' (له علي درهمان في عشرة) and claims they intended the meaning derived from calculation (i.e., a ratio), the debt obligation is established as twenty dirhams. This interpretation holds precedence in this specific phrasing.