Big Dog Aviation is using a new weather radar display that has an MTBR of 30,000 hours. Each aircraft requires two displays. After using it in 10 airplanes across the fleet over the last 5 years, their experience is a mean time between unscheduled removal (MTBUR) of 24,000 unit hours. How many radar displays will the company need if they want at least two replacement units available per month at each of their five locations to cover for an average daily flight time of 12 hours for each of their 100 airplanes?