Machine hours and electricity costs for Wells Industries for 2018 were as follows:

	Machine	Electricity
Month	Hours	Costs
January	2,000	$ 9,200
February	2,320	10,500
March	1,520	6,750
April	2,480	11,500
May	3,040	14,125
June	2,640	11,000
July	3,280	12,375
August	2,800	11,375
September	1,600	7,750
October	2,960	13,000
November	3,760	15,500
December	3,360	13,875

Required:

A.	Using the high-low method, develop an estimate of variable electricity costs per machine hour (2 marks).
B.	Using the high-low method, develop an estimate of fixed electricity costs per month (2 marks).
C.	Using the high-low method, develop a cost function for monthly electricity costs (2 marks).
D.	Estimate electricity costs for a month in which 3,000 machine hours are worked (2 marks).
E.	Describe the usefulness of the high-low method (2 marks)