Barbara Company keeps detailed records of maintenance expense. March had the highest level of activity with 16,000 units and August had the lowest level of activity with only 9,000 units produced. Maintenance expense for March was $36,000 and for August it was $23,750. The average maintenance cost for the year was $26,700 and the predetermined overhead rate was $2.50 per unit produced. Show all your calculations for the following questions: a) Using the High-Low method calculate the fixed cost and the variable rate per unit. Round the variable rate to 2 decimal points. ( 5 marks) b) Show the cost equation for maintenance expense. ( 2.5 Marks) c) If the expected production is estimated to be 40,000 units what would be the estimated maintenance expense be? ( 2.5 Marks)