Amanager must decide between two machines. the manager will take into account each machine's operating costs and initial costs, and its breakdown and repair times. machine a has a projected average operating time of 134 hours and a projected average repair time of 7 hours. projected times for machine b are an average operating time of 64 hours and a repair time of 4 hours. what are the projected availabilities of each machine? (round your answers to 3 decimal places.) availability machine a machine b