Brazilia Bus Tours has incurred the following bus maintenance costs during the recent tourist season. (The real is Brazils national monetary unit. On the day this exercise was written, the real was equivalent in value to .5092 U.S. dollar.)

Month	Miles Traveled by Tour Buses		Maintenance Cost
November	14,700		20,500 real
December	17,200		18,700
January	19,700		18,850
February	23,800		19,300
March	31,300		20,500
April	13,300		17,800

1.	Use the high-low method to estimate the variable cost per tour mile traveled and the fixed cost per month. (Round "Variable cost per tour mile" to 3 decimal places.)

2.	Develop a formula to express the cost behavior exhibited by the companys maintenance cost. (Round "Variable cost per tour mile" to 3 decimal places.)

3.	Predict the level of maintenance cost that would be incurred during a month when 42,000 tour miles are driven.