The following data obtained from XYZ Corporation represent the total overhead cost and the overhead working hours for the past ten weeks: 1 20 Period Working Hours Overhead Costs 100 12000 2. 60 22000 3 10000 4 100 33000 5 20000 6 16000 7 40 14000 8 120 40000 9 80 22000 10 40 11000 80 60 Required 1- Plot the relationship between Working-Hours and overhead Costs 2- Use the high-low method to compute the cost function, relating working-hours and overhead costs 2- What is the increase in maintenance costs for each 1500 working-hours