ἑκᾰτοστός · hekatostos — LSJ
hundredth, Hdt. 1.47, etc. ; ἐπʼ ἑκατοστὰ ἐκφέρειν to bear a hundredfold, Id. 4.198.
ἑκατοστή, ἡ, tax of one per cent., Ar. V. 658, X. Ath. 1.17, PGnom. 85, etc. ; ἐκ τῶν χρημάτων ἑ. IG 2.721 Ai 12 : also, = τόκοι ἑκατοστιαῖοι, Plu. Luc. 20.