4) Tyson Industries has collected the following monthly expense data to be used in analysing the cost behaviour of maintenance costs. Month Maintenance Cost Machine Hours January 2,900 300 February 3,000 400 March 3,600 600 April 4,300 790 May 3,200 500 June 4,500 800 Required: Using the high-low method of analyzing costs: (a) What is the estimated variable portion of maintenance costs per factory machine hour? (b) (c) 2 Marks What is the estimated fixed maintenance cost each month? 2 Marks If it is estimated that 5,000 factory machine hours will be run in July, what is the expected total maintenance cost for July? 1 Mark