Reference for Bava Kamma 190:11

תניא כוותיה דרב פפא ר' שמעון אומר רואין אותה כאילו היא שומא אצלו בכסף למחצה לשליש ולרביע

but where they differed was as to whether the robber should be entitled to retain a half or a third or a fourth<span class="x" onmousemove="('comment',' I.e., in accordance with the definite percentage in the profits fixed in a given province to be shared by a contractor for his care and attendance to the welfare of the article in question; cf. B.M. V, 4-5. ');">⁹</span>

Jastrow