Chapter 3 Operating Processes: Planning and Control 91 tchem Fleet, Inc., has incurred the following maintenance costs on its fleet of taxicabs during the past six months. Use the high/low cost estimation method to determine the expected cost if 12,000 miles are logged in one month. Month Total Miles Logged 13,255 8,650 12,250 18,200 9,120 12,750 Maintenance Cost $26,000 17,000 21,400 31,600 19,400 24,000