Mujianto, Indarto, Rohmini Indah Lestari. INVESTMENT ANALYSIS OF GROOVE ROLLER PRESSURE FEEDER (GRPF) TO IMPROVE PRODUCTION COST EFFICIENCY: A CASE STUDY OF PG TRANGKIL SUGAR FACTORY. Jurnal Riset Ekonomi dan Bisnis. 2026;19(2):227-241. doi:10.26623/jreb.v19i2.15709