Machine hours and electricity costs for AMK Industries for the past eleven months were as follows:

Month	Electricity Costs	Machine Hours
January	$12,600	2,000
February	14,000	2,400
March	9,310	1,400
April	15,200	2,600
May	19,000	2,300
June	15,500	3,300
July	17,000	3,600
August	15,500	3,000
September	10,700	1,500
October	17,700	3,300
November	21,000	4,200

Required:

a.	Using the high-low method, develop an estimate of variable electricity costs per machine hour. (Round to the nearest penny)
b.	Using the high-low method, develop an estimate of fixed electricity costs per month.
c.	Using the high-low method, develop a cost function for monthly electricity costs.
d.	Estimate electricity costs for a month in which 5,000 machine hours are worked.