The behavior of the annual maintenance and repair cost in the Grounds Department of the Allegheny Public School District is shown by the solid line in the following graph. The dashed line depicts a semivariable-cost approximation of the department€™s repair and maintenance cost.

Required
1. What is the actual (curvilinear) and estimated (semivariable) cost shown by the graph for each of the following activity levels?

2. How good an approximation does the semivariable-cost pattern provide if the department€™s relevant range is 40,000 to 60,000 miles per month? What if the relevant range is 20,000 to 90,000 miles permonth?

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Monthly repair and maintenance cost Actual cost (curvilinear) $4,000 Approximation (semivariable) $3,000 $2,000 t $1,000 Thousands of 10 20 30 40 50 60 70 80 90 100 miles driven Actual Estimated a. 20,000 miles b. 40,000 miles C. 60,000 miles d. 90,000 miles