Minco produces sillca using eight furnaces 24 hours a day, five days a week. During a typical week, preventive maintenance takes 65 hours and other downtimes takes 39 hours. What are the available furnace hours per week (the best operating level)? How many hours per week does Minco use the furnaces to produce silica (the capacily used)? What is the utilization ratio? Round your answer to two decimal places. How many hours per week would Minco have to operate the fumaces to have a capacily unlization ratio of 0.927 Roind jour answer bo ons decimal