Where does “sajanti” come from?

sajanti (Ingrian) comes from Estonian sajand, from Estonian sada, from Proto-Finnic sata, from Proto-Uralic śata, from Proto-Indo-Iranian ćata, from Proto-Indo-European ḱm̥tóm, from Proto-Indo-European déḱm̥ — ten.

Ancestry of “sajanti”, step by step

StepLanguageWordMeaning
1Estoniansajandcentury
2Estoniansadahundred
3Proto-Finnicsatahundred
4Proto-Uralicśatahundred
5Proto-Indo-Iranianćata—
6Proto-Indo-Europeanḱm̥tómhundred
7Proto-Indo-Europeandéḱm̥ten
Every word from Proto-Indo-European déḱm̥ →Every word from Proto-Indo-European ḱm̥tóm →Every word from Proto-Indo-Iranian ćata →