DYNAMICAL ANALYSIS OF TWO LOAN CATEGORIES IN A BANKING SYSTEM WITH NON-PERFORMING LOANS - Damayanti, Onik Febria; Darti, Isnani; Suryanto, Agus; Shofianah, Nur; Trisilowati, Trisilowati (BAREKENG: Jurnal Ilmu Matematika dan Terapan, 2026)