a) Sarah the management accountant in an organization. She has been assigned the task of budgeting payroll cost for the next quarter. Payroll information for the last four quarters is as follows: Quarter Work hours cost *000' (sh '000") 15 400 N - 20 480 18 440 4 21 500 Required: ) Using the High low method determine the cost of labour function (7 marks) i) Determine the total cost if the labour hour to be worked in he next quarter is 25,000 marks)