DY – Except where it doesn’t, for example Chalipin.
I hear the Rayah from the Shaarei Teshuva though, and thank you for the Maare Makom.
LUL – A perutah is 1/8 of an Issar Ha’Italki 🙂 In all seriousness, if you hold it is 1/2 of a grain of silver (which is the Shittah of the Rambam in Mishnayos Kiddushin), it is currently worth about 1.75 cents, which is less than 10 Agurot.