4. Roy's Bus Tour Company experienced the following bus maintenance costs during the last tourist season. Month Miles Traveled Maintenance Cost $ November December January February March April 12,750 15,900 19,050 22,500 30,000 12,000 17,100 17,400 17,555 18,00 18,750 16,500 Using the Hi-Lo method, calculate the following: a. Variable maintenance cost per mile traveled b. Fixed maintenance cost per month C. Expected total maintenance cost at 25,000 miles/month $