TY JOUR TI IMPROVING INDUSTRY PERFORMANCE INDICATORS ACTIVITIES IN THE HOTEL BUSINESS KW hotel business KW room stock KW revenue KW net income KW calculation KW analysis KW economic and mathemat-ical model JO Bulletin of the Angarsk State Technical University AU Bychkova, G.M. PY 2023 IS 1 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»