QUESTION 4 XYZ Inc. employed several maintenance engineers to keep the equipment running in peak condition. Over the past eight months, Travis incurred the following maintenance cost for these engineers. Plant activity is best measured by direct labor hours. Month January February March April May June July August Direct Labor Hours 1,700 2,000 1,800 1,600 1,500 1,300 1,000 1,400 Maintenance Cost $14,300 $16,200 $16,700 $14,000 $14,300 $13,000 $12,200 $14,200 REQUIRED a) Using the high-low method, determine the fixed and variable components of the maintenance costs. (15 Marks) b) Briefly explain advantage using ABC Costing in management Systems (10 Marks)